ここに記載されている内容は必ずしも正しくないかもしれませんが、プレートを製作する文字を選ぶ時の参考になればと思っています。

現行(2001年9月から)の英国のナンバープレートの例 AB12 CDE 
最初の2文字のアルファベットは地域コードをその次の数字2文字は登録年を表します。
後ろの3文字はランダムとなります。
フロントは白地に黒文字 リヤは黄地に黒文字のプレート 左端にユーロマークGBの青い帯は任意で入れます。

登録年月による二桁の数字表
3月1日〜8月末  9月1日〜2月末
2001〜02  Y        51
2002〜03  02        52
2003〜04  03        53
2004〜05  04        54
2005〜06  05        55
2006〜07  06        56
2007〜08  07        57
2008〜09  08        58
2009〜10  09        59
2010〜11  10        60
2011〜12  11        61
2012〜13  12        62
2013〜14  13        63
2014〜15  14        64
2015〜16  15        65
2016〜17  16        66
2017〜18  17        67
2018〜19  18        68
2019〜20  19        69
2020〜21  20        70
2021〜22  21        71
2022〜23 and so on until 50/00
in 2050/51

2001年以降の地域コード
* AA - Anglia: Peterborough
* AB - Anglia: Peterborough
* AC - Anglia: Peterborough
* AD - Anglia: Peterborough
* AE - Anglia: Peterborough
* AF - Anglia: Peterborough
* AG - Anglia: Peterborough
* AH - Anglia: Peterborough
* AI - unused
* AJ - Anglia: Peterborough
* AK - Anglia: Peterborough
* AL - Anglia: Peterborough, but reserved for ‘Select’ marks
* AM - Anglia: Peterborough
* AN - Anglia: Peterborough
* AO - Anglia: Norwich
* AP - Anglia: Norwich
* AQ - unused
* AR - Anglia: Norwich
* AS - Anglia: Norwich
* AT - Anglia: Norwich
* AU - Anglia: Ipswich
* AV - Anglia: Ipswich
* AW - Anglia: Ipswich
* AX - Anglia: Ipswich
* AY - Anglia: Ipswich
* AZ - unused

* BA - Birmingham
* BB - Birmingham
* BC - Birmingham
* BD - Birmingham
* BE - Birmingham
* BF - Birmingham
* BG - Birmingham
* BH - Birmingham
* BI - unused
* BJ - Birmingham
* BK - Birmingham
* BL - Birmingham
* BM - Birmingham
* BN - Birmingham
* BO - Birmingham
* BP - Birmingham
* BQ - unused
* BR - Birmingham
* BS - Birmingham
* BT - Birmingham
* BU - Birmingham
* BV - Birmingham
* BW - Birmingham
* BX - Birmingham
* BY - Birmingham
* BZ - unused

* CA - Cymru: Cardiff
* CB - Cymru: Cardiff
* CC - Cymru: Cardiff
* CD - Cymru: Cardiff
* CE - Cymru: Cardiff
* CF - Cymru: Cardiff
* CG - Cymru: Cardiff
* CH - Cymru: Cardiff
* CI - unused
* CJ - Cymru: Cardiff
* CK - Cymru: Cardiff
* CL - Cymru: Cardiff
* CM - Cymru: Cardiff
* CN - Cymru: Cardiff
* CO - Cymru: Cardiff
* CP - Cymru: Swansea
* CQ - unused
* CR - Cymru: Swansea
* CS - Cymru: Swansea
* CT - Cymru: Swansea
* CU - Cymru: Swansea
* CV - Cymru: Swansea
* CW - Cymru: Bangor
* CX - Cymru: Bangor
* CY - Cymru: Bangor, but reserved for ‘Select’ marks
* CZ - unused

* DA - Deeside-Shrewsbury: Chester
* DB - Deeside-Shrewsbury: Chester
* DC - Deeside-Shrewsbury: Chester
* DD - Deeside-Shrewsbury: Chester
* DE - Deeside-Shrewsbury: Chester
* DF - Deeside-Shrewsbury: Chester
* DG - Deeside-Shrewsbury: Chester
* DH - Deeside-Shrewsbury: Chester
* DI - unused
* DJ - Deeside-Shrewsbury: Chester
* DK - Deeside-Shrewsbury: Chester
* DL - Deeside-Shrewsbury: Shrewsbury
* DM - Deeside-Shrewsbury: Shrewsbury
* DN - Deeside-Shrewsbury: Shrewsbury
* DO - Deeside-Shrewsbury: Shrewsbury
* DP - Deeside-Shrewsbury: Shrewsbury
* DQ - unused
* DR - Deeside-Shrewsbury: Shrewsbury, but reserved for ‘Select’ marks
* DS - Deeside-Shrewsbury: Shrewsbury
* DT - Deeside-Shrewsbury: Shrewsbury
* DU - Deeside-Shrewsbury: Shrewsbury
* DV - Deeside-Shrewsbury: Shrewsbury
* DW - Deeside-Shrewsbury: Shrewsbury
* DX - Deeside-Shrewsbury: Shrewsbury
* DY - Deeside-Shrewsbury: Shrewsbury
* DZ - unused

* EA - Essex: Chelmsford
* EB - Essex: Chelmsford
* EC - Essex: Chelmsford
* ED - Essex: Chelmsford, but reserved for ‘Select’ marks
* EE - Essex: Chelmsford
* EF - Essex: Chelmsford
* EG - Essex: Chelmsford
* EH - Essex: Chelmsford
* EI - unused
* EJ - Essex: Chelmsford
* EK - Essex: Chelmsford
* EL - Essex: Chelmsford
* EM - Essex: Chelmsford
* EN - Essex: Chelmsford
* EO - Essex: Chelmsford
* EP - Essex: Chelmsford
* EQ - unused
* ER - Essex: Chelmsford
* ES - Essex: Chelmsford
* ET - Essex: Chelmsford
* EU - Essex: Chelmsford
* EV - Essex: Chelmsford
* EW - Essex: Chelmsford
* EX - Essex: Chelmsford
* EY - Essex: Chelmsford
* EZ - unused

* FA - Forest & Fens: Nottingham
* FB - Forest & Fens: Nottingham
* FC - Forest & Fens: Nottingham
* FD - Forest & Fens: Nottingham
* FE - Forest & Fens: Nottingham
* FF - Forest & Fens: Nottingham
* FG - Forest & Fens: Nottingham
* FH - Forest & Fens: Nottingham
* FI - unused
* FJ - Forest & Fens: Nottingham
* FK - Forest & Fens: Nottingham
* FL - Forest & Fens: Nottingham
* FM - Forest & Fens: Nottingham
* FN - Forest & Fens: Nottingham
* FO - Forest & Fens: Nottingham, but withheld for reasons of taste
* FP - Forest & Fens: Nottingham
* FQ - unused
* FR - Forest & Fens: Lincoln
* FS - Forest & Fens: Lincoln
* FT - Forest & Fens: Lincoln
* FU - Forest & Fens: Lincoln, but withheld for reasons of taste
* FV - Forest & Fens: Lincoln
* FW - Forest & Fens: Lincoln
* FX - Forest & Fens: Lincoln
* FY - Forest & Fens: Lincoln
* FZ - unused

* GA - Garden of England: Maidstone
* GB - Garden of England: Maidstone
* GC - Garden of England: Maidstone
* GD - Garden of England: Maidstone
* GE - Garden of England: Maidstone
* GF - Garden of England: Maidstone
* GG - Garden of England: Maidstone
* GH - Garden of England: Maidstone
* GI - unused
* GJ - Garden of England: Maidstone
* GK - Garden of England: Maidstone
* GL - Garden of England: Maidstone
* GM - Garden of England: Maidstone
* GN - Garden of England: Maidstone
* GO - Garden of England: Maidstone
* GP - Garden of England: Brighton
* GQ - unused
* GR - Garden of England: Brighton
* GS - Garden of England: Brighton
* GT - Garden of England: Brighton
* GU - Garden of England: Brighton
* GV - Garden of England: Brighton
* GW - Garden of England: Brighton
* GX - Garden of England: Brighton
* GY - Garden of England: Brighton
* GZ - unused

* HA - Hampshire & Dorset: Bournemouth
* HB - Hampshire & Dorset: Bournemouth
* HC - Hampshire & Dorset: Bournemouth
* HD - Hampshire & Dorset: Bournemouth
* HE - Hampshire & Dorset: Bournemouth
* HF - Hampshire & Dorset: Bournemouth
* HG - Hampshire & Dorset: Bournemouth
* HH - Hampshire & Dorset: Bournemouth
* HI - unused
* HJ - Hampshire & Dorset: Bournemouth
* HK - Hampshire & Dorset: Portsmouth
* HL - Hampshire & Dorset: Portsmouth
* HM - Hampshire & Dorset: Portsmouth
* HN - Hampshire & Dorset: Portsmouth
* HO - Hampshire & Dorset: Portsmouth
* HP - Hampshire & Dorset: Portsmouth
* HQ - unused
* HR - Hampshire & Dorset: Portsmouth
* HS - Hampshire & Dorset: Portsmouth
* HT - Hampshire & Dorset: Portsmouth
* HU - Hampshire & Dorset: Portsmouth
* HV - Hampshire & Dorset: Portsmouth
* HW - Hampshire & Dorset: Portsmouth (Isle of Wight only)
* HX - Hampshire & Dorset: Portsmouth
* HY - Hampshire & Dorset: Portsmouth
* KA - Luton
* KB - Luton
* KC - Luton
* KD - Luton
* KE - Luton
* KF - Luton
* KG - Luton
* KH - Luton
* KI - unused
* KJ - Luton
* KK - Luton
* KL - Luton
* KM - Northampton
* KN - Northampton
* KO - Northampton
* KP - Northampton
* KQ - unused
* KR - Northampton
* KS - Northampton
* KT - Northampton
* KU - Northampton
* KV - Northampton
* KW - Northampton
* KX - Northampton
* KY - Northampton
* KZ - unused

* LA - London: Wimbledon
* LB - London: Wimbledon
* LC - London: Wimbledon
* LD - London: Wimbledon
* LE - London: Wimbledon
* LF - London: Wimbledon
* LG - London: Wimbledon
* LH - London: Wimbledon
* LI - unused
* LJ - London: Wimbledon
* LK - London: Stanmore
* LL - London: Stanmore
* LM - London: Stanmore
* LN - London: Stanmore
* LO - London: Stanmore
* LP - London: Stanmore
* LQ - unused
* LR - London: Stanmore
* LS - London: Stanmore
* LT - London: Stanmore
* LU - London: Sidcup
* LV - London: Sidcup
* LW - London: Sidcup
* LX - London: Sidcup
* LY - London: Sidcup
* LZ - unused

* MA - Manchester & Merseyside
* MB - Manchester & Merseyside
* MC - Manchester & Merseyside
* MD - Manchester & Merseyside
* ME - Manchester & Merseyside
* MF - Manchester & Merseyside
* MG - Manchester & Merseyside
* MH - Manchester & Merseyside
* MI - unused
* MJ - Manchester & Merseyside
* MK - Manchester & Merseyside
* ML - Manchester & Merseyside
* MM - Manchester & Merseyside
* MN - Manchester & Merseyside
* MO - Manchester & Merseyside
* MP - Manchester & Merseyside
* MQ - unused
* MR - Manchester & Merseyside
* MS - Manchester & Merseyside
* MT - Manchester & Merseyside
* MU - Manchester & Merseyside
* MV - Manchester & Merseyside
* MW - Manchester & Merseyside
* MX - Manchester & Merseyside
* MY - Manchester & Merseyside
* MZ - unused

* NA - North: Newcastle
* NB - North: Newcastle
* NC - North: Newcastle
* ND - North: Newcastle
* NE - North: Newcastle
* NF - North: Newcastle
* NG - North: Newcastle
* NH - North: Newcastle
* NI - unused
* NJ - North: Newcastle
* NK - North: Newcastle
* NL - North: Newcastle
* NM - North: Newcastle
* NN - North: Newcastle
* NO - North: Newcastle
* NP - North: Stockton
* NQ - unused
* NR - North: Stockton
* NS - North: Stockton
* NT - North: Stockton
* NU - North: Stockton
* NV - North: Stockton
* NW - North: Stockton
* NX - North: Stockton
* NY - North: Stockton
* NZ - unused

* OA - Oxford
* OB - Oxford
* OC - Oxford
* OD - Oxford
* OE - Oxford
* OF - Oxford
* OG - Oxford
* OH - Oxford
* OI - unused
* OJ - Oxford
* OK - Oxford
* OL - Oxford
* OM - Oxford
* ON - Oxford
* OO - Oxford
* OP - Oxford
* OQ - unused
* OR - Oxford
* OS - Oxford
* OT - Oxford
* OU - Oxford
* OV - Oxford
* OW - Oxford
* OX - Oxford
* OY - Oxford
* OZ - unused

* PA - Preston: Preston
* PB - Preston: Preston
* PC - Preston: Preston
* PD - Preston: Preston
* PE - Preston: Preston
* PF - Preston: Preston
* PG - Preston: Preston
* PH - Preston: Preston
* PI - unused
* PJ - Preston: Preston
* PK - Preston: Preston
* PL - Preston: Preston
* PM - Preston: Preston
* PN - Preston: Preston
* PO - Preston: Preston
* PP - Preston: Preston
* PQ - unused
* PR - Preston: Preston
* PS - Preston: Preston
* PT - Preston: Preston
* PU - Preston: Carlisle
* PV - Preston: Carlisle
* PW - Preston: Carlisle
* PX - Preston: Carlisle
* PY - Preston: Carlisle
* RA - Reading
* RB - Reading
* RC - Reading
* RD - Reading
* RE - Reading
* RF - Reading
* RG - Reading
* RH - Reading
* RI - unused
* RJ - Reading
* RK - Reading
* RL - Reading
* RM - Reading
* RN - Reading
* RO - Reading
* RP - Reading
* RQ - unused
* RR - Reading
* RS - Reading
* RT - Reading
* RU - Reading
* RV - Reading
* RW - Reading
* RX - Reading
* RY - Reading
* RZ - unused

* SA - Scotland: Glasgow
* SB - Scotland: Glasgow
* SC - Scotland: Glasgow
* SD - Scotland: Glasgow
* SE - Scotland: Glasgow
* SF - Scotland: Glasgow
* SG - Scotland: Glasgow
* SH - Scotland: Glasgow
* SI - unused
* SJ - Scotland: Glasgow
* SK - Scotland: Edinburgh
* SL - Scotland: Edinburgh
* SM - Scotland: Edinburgh
* SN - Scotland: Edinburgh
* SO - Scotland: Edinburgh
* SP - Scotland: Dundee
* SQ - unused
* SR - Scotland: Dundee
* SS - Scotland: Dundee
* ST - Scotland: Dundee
* SU - Scotland: Aberdeen
* SV - Scotland: Aberdeen
* SW - Scotland: Aberdeen
* SX - Scotland: Inverness
* SY - Scotland: Inverness
* SZ - unused


* TF - unused (though a few issued, probably by Scotland: Glasgow)

* TJ - unused (though a few issued, probably by Scotland: Glasgow)
* TK - unused (though a few issued, probably by Scotland: Edinburgh)
* TL - unused (though a few issued, probably by Scotland: Edinburgh)

* TN - unused (TN07 issued by Scotland: Edinburgh, instead of SN07)

* TP - unused (though a few issued, probably by Scotland: Edinburgh)
* TY - unused (though a few issued, probably by Scotland: Inverness)
* VA - Severn Valley: Worcester
* VB - Severn Valley: Worcester
* VC - Severn Valley: Worcester
* VD - Severn Valley: Worcester, but withheld for reasons of taste ?
* VE - Severn Valley: Worcester
* VF - Severn Valley: Worcester
* VG - Severn Valley: Worcester
* VH - Severn Valley: Worcester
* VI - unused
* VJ - Severn Valley: Worcester
* VK - Severn Valley: Worcester
* VL - Severn Valley: Worcester
* VM - Severn Valley: Worcester
* VN - Severn Valley: Worcester
* VO - Severn Valley: Worcester
* VP - Severn Valley: Worcester
* VQ - unused
* VR - Severn Valley: Worcester
* VS - Severn Valley: Worcester
* VT - Severn Valley: Worcester
* VU - Severn Valley: Worcester
* VV - Severn Valley: Worcester
* VW - Severn Valley: Worcester
* VX - Severn Valley: Worcester
* VY - Severn Valley: Worcester
* VZ - unused

* WA - West: Exeter
* WB - West: Exeter
* WC - West: Exeter
* WD - West: Exeter
* WE - West: Exeter
* WF - West: Exeter
* WG - West: Exeter
* WH - West: Exeter
* WI - unused
* WJ - West: Exeter
* WK - West: Truro
* WL - West: Truro
* WM - West: Bristol
* WN - West: Bristol
* WO - West: Bristol
* WP - West: Bristol
* WQ - unused
* WR - West: Bristol
* WS - West: Bristol
* WT - West: Bristol
* WU - West: Bristol
* WV - West: Bristol
* WW - West: Bristol
* WX - West: Bristol
* WY - West: Bristol
* WZ - unused
* XA - temporary export plates
* XB - temporary export plates
* XC - temporary export plates
* XD - temporary export plates
* XE - temporary export plates
* XF - temporary export plates
* YA - Yorkshire: Leeds, but possibly some reserved for ‘Select’ marks ?
* YB - Yorkshire: Leeds
* YC - Yorkshire: Leeds
* YD - Yorkshire: Leeds
* YE - Yorkshire: Leeds
* YF - Yorkshire: Leeds
* YG - Yorkshire: Leeds
* YH - Yorkshire: Leeds
* YI - unused
* YJ - Yorkshire: Leeds
* YK - Yorkshire: Leeds
* YL - Yorkshire: Sheffield
* YM - Yorkshire: Sheffield
* YN - Yorkshire: Sheffield
* YO - Yorkshire: Sheffield, but possibly some reserved for ‘Select’ marks ?
* YP - Yorkshire: Sheffield
* YQ - unused
* YR - Yorkshire: Sheffield
* YS - Yorkshire: Sheffield
* YT - Yorkshire: Sheffield
* YU - Yorkshire: Sheffield
* YV - Yorkshire: Beverley
* YW - Yorkshire: Beverley
* YX - Yorkshire: Beverley
* YY - Yorkshire: Beverley

1974年〜2001年までのプレートはフロントが白地に黒文字 リヤが黄地に黒文字
1903年〜1974年までのプレートは前後とも黒地に白もしくはシルバー文字
ABC 123Dの場合、最初の2文字は地域コード その次はランダム 次の数字3桁もランダム最後の文字が年代
A123 BCD
の場合、最初の文字は年代 その後の数字3桁はランダム 5文字目もランダム、最後の2文字は地域コード
1963年〜2001年の登録年代コード
Old suffix letters     Old prefix letters
    ABC 123 D    A 123 BCD    
Jan '63 to Dec '63 A    A Aug '83 to July '84
Jan '64 to Dec '64 B    B Aug '84 to July '85
Jan '65 to Dec '65 C   C Aug '85 to July '86
Jan '66 to Dec '66 D    D Aug '86 to July '87
Jan '67 to July '67 E    E Aug '87 to July '88
Aug '67 to July '68 F    F Aug '88 to July '89
Aug '68 to July '69 G    G Aug '89 to July '90
Aug '69 to July '70 H    H Aug '90 to July '91
Aug '70 to July '71 J    J Aug '91 to July '92
Aug '71 to July '72 K    K Aug '92 to July '93
Aug '72 to July '73 L    L Aug '93 to July '94
Aug '73 to July '74 M    M Aug '94 to July '95
Aug '74 to July '75 N    N Aug '95 to July '96
Aug '75 to July '76 P    P Aug '96 to July '97
Aug '76 to July '77 R    R Aug '97 to July '98
Aug '77 to July '78 S    S Aug '98 to Feb '99
Aug '78 to July '79 T    T March '99 to Aug '99
Aug '79 to July '80 V    V Sept '99 to Feb 2000
Aug '80 to July '81 W    W March 2000 to Aug 2000
Aug '81 to July '82 X    X Sept 2000 to Feb 2001
Aug '82 to July '83 Y    Y March 2001 to Aug 2001

1999年以前の地域コード
A - London
* AA - Bournemouth (may originally have covered at least part of Wiltshire)
* AB - Worcester
* AC - Coventry
* AD - Gloucester
* AE - Bristol
* AF - Truro
* AG - Hull
* AH - Norwich
* AI - County Meath
* AJ - Middlesbrough
* AK - Sheffield
* AL - Nottingham
* AM - Swindon
* AN - Reading (MAN used in Isle of Man)
* AO - Carlisle
* AP - Brighton
* AQ - unused
* AR - Chelmsford
* AS - Inverness
* AT - Hull
* AU - Nottingham
* AV - Peterborough
* AW - Shrewsbury
* AX - Cardiff
* AY - Leicester
* AZ - Belfast

* B - Lancashire
* BA - Manchester
* BB - Newcastle-upon-Tyne
* BC - Leicester
* BD - Northampton
* BE - Lincoln
* BF - Stoke-on-Trent
* BG - Liverpool
* BH - Luton
* BI - County Monaghan
* BJ - Ipswich
* BK - Portsmouth
* BL - Reading
* BM - Luton
* BN - Manchester or Bolton
* BO - Cardiff
* BP - Portsmouth
* BQ - unused
* BR - Newcastle-upon-Tyne
* BS - Aberdeen
* BT - Leeds
* BU - Manchester
* BV - Preston
* BW - Oxford
* BX - Haverfordwest
* BY - London (North-West)
* BZ - County Down

* C - West Yorkshire
* CA - Chester
* CB - Manchester
* CC - Bangor
* CD - Brighton
* CE - Peterborough
* CF - Reading
* CG - Bournemouth
* CH - Nottingham
* CI - Queens County (now County Laois)
* CJ - Gloucester
* CK - Preston
* CL - Norwich
* CM - Liverpool
* CN - Newcastle-upon-Tyne
* CO - Exeter
* CP - Huddersfield
* CQ - unused
* CR - Southampton
* CS - Glasgow
* CT - Lincoln
* CU - Newcastle-upon-Tyne
* CV - Truro
* CW - Preston
* CX - Huddersfield
* CY - Swansea (SCY used for Isles of Scilly)
* CZ - Belfast

* D - Kent
* DA - Birmingham
* DB - Manchester
* DC - Middlesbrough
* DD - Gloucester
* DE - Haverfordwest
* DF - Gloucester
* DG - Gloucester
* DH - Dudley
* DI - County Roscommon
* DJ - Liverpool
* DK - Rochdale, later Manchester
* DL - Portsmouth
* DM - Chester
* DN - Leeds
* DO - Lincoln
* DP - Reading
* DQ - unused
* DR - Exeter
* DS - Glasgow
* DT - Sheffield
* DU - Coventry
* DV - Exeter
* DW - Cardiff
* DX - Ipswich
* DY - Brighton
* DZ - County Antrim

* E - Staffordshire
* EA - Dudley
* EB - Peterborough
* EC - Preston
* ED - Liverpool
* EE - Lincoln
* EF - Middlesbrough
* EG - Peterborough
* EH - Stoke-on-Trent
* EI - County Sligo
* EJ - Haverfordwest
* EK - Liverpool
* EL - Bournemouth
* EM - Liverpool
* EN - Bury, later Manchester
* EO - Preston
* EP - Swansea
* EQ - unused
* ER - Peterborough
* ES - Dundee
* ET - Sheffield (previously used for Rotherham?)
* EU - Bristol
* EV - Chelmsford
* EW - Peterborough
* EX - Norwich
* EY - Bangor
* EZ - Belfast

* F - Essex
* FA - Stoke-on-Trent
* FB - Bristol
* FC - Oxford
* FD - Dudley
* FE - Lincoln
* FF - Bangor
* FG - Brighton
* FH - Gloucester
* FI - County Tipperary, North Riding
* FJ - Exeter
* FK - Dudley
* FL - Peterborough
* FM - Chester
* FN - Maidstone
* FO - Gloucester
* FP - Leicester
* FQ - unused
* FR - Preston
* FS - Edinburgh
* FT - Newcastle-upon-Tyne
* FU - Lincoln
* FV - Preston
* FW - Lincoln
* FX - Bournemouth
* FY - Liverpool
* FZ - Belfast

* G - Glasgow
* GA - Glasgow
* GB - Glasgow
* GC - London (South-West)
* GD - Glasgow
* GE - Glasgow
* GF - London (South-West)
* GG - Glasgow
* GH - London (South-West)
* GI - County Tipperary, South Riding
* GJ - London (South-West)
* GK - London (South-West)
* GL - Truro
* GM - Reading
* GN - London (South-West)
* GO - London (South-West)
* GP - London (South-West)
* GQ - unused
* GR - Newcastle-upon-Tyne
* GS - Luton
* GT - London (South-West)
* GU - London (South-East)
* GV - Ipswich
* GW - London (South-East)
* GX - London (South-East)
* GY - London (South-East)
* GZ - Belfast

* H - London
* HA - Dudley
* HB - Cardiff
* HC - Brighton
* HD - Huddersfield
* HE - Sheffield
* HF - Liverpool
* HG - Preston
* HH - Carlisle
* HI - County Tipperary, South Riding
* HJ - Chelmsford (used for Southend-on-Sea before 1965)
* HK - Chelmsford
* HL - Sheffield
* HM - London (Central)
* HN - Middlesbrough
* HO - Bournemouth
* HP - Coventry
* HQ - unused
* HR - Swindon
* HS - Glasgow
* HT - Bristol
* HU - Bristol
* HV - London (Central)
* HW - Bristol
* HX - London (Central)
* HY - Bristol
* HZ - County Tyrone

* IA - County Antrim
* IB - County Armagh
* IC - County Carlow
* ID - County Cavan
* IE - County Clare
* IF - County Cork
* IG - Enniskillen
* IH - County Donegal
* II - unused
* IJ - County Down
* IK - County Dublin
* IL - County Fermanagh
* IM - County Galway
* IN - County Kerry
* IO - County Kildare
* IP - County Kilkenny
* IQ - unused
* IR - Kings County (now County Offaly)
* IS - County Mayo
* IT - County Leitrim
* IU - County Limerick
* IV - County Limerick
* IW - County Londonderry/Derry
* IX - County Longford
* IY - County Louth
* IZ - County Mayo

* J - Durham
* JA - Manchester
* JB - Reading
* JC - Bangor
* JD - London (Central)
* JE - Peterborough
* JF - Leicester
* JG - Maidstone
* JH - Reading
* JI - County Tyrone
* JJ - Maidstone
* JK - Brighton
* JL - Lincoln
* JM - Reading
* JN - Chelmsford (used for Southend-on-Sea before 1965)
* JO - Oxford
* JP - Liverpool
* JQ - unused
* JR - Newcastle-upon-Tyne
* JS - Inverness (possibly used for Bristol after 1974?)
* JT - Bournemouth
* JU - Leicester
* JV - Lincoln
* JW - Birmingham
* JX - Huddersfield
* JY - Exeter
* JZ - County Down

* K - Liverpool
* KA - Liverpool
* KB - Liverpool
* KC - Liverpool
* KD - Liverpool
* KE - Maidstone
* KF - Liverpool
* KG - Cardiff
* KH - Hull
* KI - County Waterford
* KJ - Maidstone
* KK - Maidstone
* KL - Maidstone
* KM - Maidstone
* KN - Maidstone
* KO - Maidstone
* KP - Maidstone
* KQ - unused
* KR - Maidstone
* KS - Edinburgh
* KT - Maidstone
* KU - Sheffield
* KV - Coventry
* KW - Sheffield
* KX - Luton
* KY - Sheffield
* KZ - County Antrim

* L - Glamorganshire
* LA - London (North-West) (used for London County Council before 1965)
* LB - London (North-West) (used for London County Council before 1965)
* LC - London (North-West) (used for London County Council before 1965)
* LD - London (North-West) (used for London County Council before 1965)
* LE - London (North-West) (used for London County Council before 1965)
* LF - London (North-West) (used for London County Council before 1965)
* LG - Chester
* LH - London (North-West) (used for London County Council before 1965)
* LI - County Westmeath
* LJ - Bournemouth
* LK - London (North-West) (used for London County Council before 1965)
* LL - London (North-West) (used for London County Council before 1965)
* LM - London (North-West) (used for London County Council before 1965)
* LN - London (North-West) (used for London County Council before 1965)
* LO - London (North-West) (used for London County Council before 1965)
* LP - London (North-West) (used for London County Council before 1965)
* LQ - unused
* LR - London (North-West) (used for London County Council before 1965)
* LS - Edinburgh
* LT - London (North-West) (used for London County Council before 1965)
* LU - London (North-West) (used for London County Council before 1965)
* LV - Liverpool
* LW - London (North-West) (used for London County Council before 1965)
* LX - London (North-West) (used for London County Council before 1965)
* LY - London (North-West) (used for London County Council before 1965)
* LZ - County Armagh

* M - Cheshire
* MA - Chester
* MB - Chester
* MC - London (North-East) (used for Middlesex before 1965)
* MD - London (North-East) (used for Middlesex before 1965)
* ME - London (North-East) (used for Middlesex before 1965)
* MF - London (North-East) (used for Middlesex before 1965)
* MG - London (North-East) (used for Middlesex before 1965)
* MH - London (North-East) (used for Middlesex before 1965)
* MI - County Wexford
* MJ - Luton
* MK - London (North-East) (used for Middlesex before 1965)
* ML - London (North-East) (used for Middlesex before 1965)
* MM - London (North-East) (used for Middlesex before 1965)
* MN - used in the Isle of Man
* MO - Reading
* MP - London (North-East) (used for Middlesex before 1965)
* MQ - unused
* MR - Swindon
* MS - Edinburgh
* MT - London (North-East) (used for Middlesex before 1965)
* MU - London (North-East) (used for Middlesex before 1965)
* MV - London (North-East) (used for Middlesex before 1965)
* MW - Swindon
* MX - London (North-East) (used for Middlesex before 1965)
* MY - London (North-East) (used for Middlesex before 1965)
* MZ - Belfast

* N - Manchester
* NA - Manchester
* NB - Manchester
* NC - Manchester
* ND - Manchester
* NE - Manchester
* NF - Manchester
* NG - Norwich
* NH - Northampton
* NI - County Wicklow
* NJ - Brighton
* NK - Luton
* NL - Newcastle-upon-Tyne
* NM - Luton
* NN - Nottingham
* NO - Chelmsford
* NP - Worcester
* NQ - unused
* NR - Leicester
* NS - Glasgow
* NT - Shrewsbury
* NU - Nottingham
* NV - Northampton
* NW - Leeds
* NX - Dudley
* NY - Cardiff
* NZ - County Londonderry/Derry

* O - Birmingham
* OA - Birmingham
* OB - Birmingham
* OC - Birmingham
* OD - Exeter
* OE - Birmingham
* OF - Birmingham
* OG - Birmingham
* OH - Birmingham
* OI - Belfast
* OJ - Birmingham
* OK - Birmingham
* OL - Birmingham
* OM - Birmingham
* ON - Birmingham
* OO - Chelmsford
* OP - Birmingham
* OQ - unused
* OR - Portsmouth
* OS - Glasgow
* OT - Portsmouth
* OU - Bristol
* OV - Birmingham
* OW - Southampton
* OX - Birmingham
* OY - London (North-West)
* OZ - Belfast

* P - Surrey
* PA - Guildford
* PB - Guildford
* PC - Guildford
* PD - Guildford
* PE - Guildford
* PF - Guildford
* PG - Guildford
* PH - Guildford
* PI - Cork
* PJ - Guildford
* PK - Guildford
* PL - Guildford
* PM - Guildford
* PN - Brighton
* PO - Portsmouth (GPO formerly used for General Post Office vehicles)
* PP - Luton
* PQ - unused
* PR - Bournemouth
* PS - Aberdeen
* PT - Newcastle-upon-Tyne
* PU - Chelmsford
* PV - Ipswich
* PW - Norwich
* PX - Portsmouth
* PY - Middlesbrough
* PZ - Belfast

* R - Derbyshire
* RA - Nottingham
* RB - Nottingham
* RC - Nottingham
* RD - Reading
* RE - Stoke-on-Trent
* RF - Stoke-on-Trent
* RG - Newcastle-upon-Tyne
* RH - Hull
* RI - County Dublin
* RJ - Manchester
* RK - London (North-West)
* RL - Truro
* RM - Carlisle
* RN - Preston
* RO - Luton
* RP - Northampton
* RQ - unused
* RR - Nottingham
* RS - Aberdeen
* RT - Ipswich
* RU - Bournemouth
* RV - Portsmouth
* RW - Coventry
* RX - Reading
* RY - Leicester
* RZ - County Antrim

* S - Edinburgh
* SA - Aberdeen
* SB - Glasgow
* SC - Edinburgh
* SD - Glasgow
* SE - Aberdeen
* SF - Edinburgh
* SG - Edinburgh
* SH - Edinburgh
* SI - County
* SJ - Glasgow
* SK - Inverness
* SL - Dundee
* SM - Carlisle
* SN - Dundee
* SO - Aberdeen
* SP - Dundee
* SQ - unused
* SR - Dundee
* SS - Aberdeen
* ST - Inverness
* SU - Glasgow
* SV - unused
* SW - Carlisle
* SX - Edinburgh
* SY - unused
* SZ - County Down

* T - Devon
* TA - Exeter
* TB - Liverpool
* TC - Bristol
* TD - Manchester
* TE - Manchester
* TF - Reading
* TG - Cardiff
* TH - Swansea
* TI - Limerick
* TJ - Liverpool
* TK - Exeter
* TL - Lincoln
* TM - Luton
* TN - Newcastle-upon-Tyne
* TO - Nottingham
* TP - Portsmouth
* TQ - unused
* TR - Southampton
* TS - Dundee
* TT - Exeter
* TU - Chester
* TV - Nottingham
* TW - Chelmsford
* TX - Cardiff
* TY - Newcastle-upon-Tyne
* TZ - Belfast

* U - Leeds
* UA - Leeds
* UB - Leeds
* UC - London (Central)
* UD - Oxford
* UE - Dudley
* UF - Brighton
* UG - Leeds
* UH - Cardiff
* UI - County Londonderry/Derry
* UJ - Shrewsbury
* UK - Birmingham
* UL - London (Central)
* UM - Leeds
* UN - Exeter
* UO - Exeter
* UP - Newcastle-upon-Tyne
* UQ - unused
* UR - Luton
* US - Glasgow
* UT - Leicester
* UU - London (Central)
* UV - London (Central)
* UW - London (Central)
* UX - Shrewsbury
* UY - Worcester
* UZ - Belfast

* V - Lanarkshire
* VA - Peterborough
* VB - Maidstone
* VC - Coventry
* VD - Lanarkshire, later Luton in 1970's, then later withdrawn from use
* VE - Peterborough
* VF - Norwich
* VG - Norwich
* VH - Huddersfield
* VI - unused
* VJ - Gloucester
* VK - Newcastle-upon-Tyne
* VL - Lincoln
* VM - Manchester
* VN - Middlesbrough
* VO - Nottingham
* VP - Birmingham
* VQ - unused
* VR - Manchester
* VS - Luton (not Glasgow?)
* VT - Stoke-on-Trent
* VU - Manchester
* VV - Northampton
* VW - Chelmsford
* VX - Chelmsford
* VY - Leeds
* VZ - County Tyrone

* W - Sheffield
* WA - Sheffield
* WB - Sheffield
* WC - Chelmsford
* WD - Dudley
* WE - Sheffield
* WF - Sheffield
* WG - Sheffield
* WH - Manchester or Bolton
* WI - Waterford
* WJ - Sheffield
* WK - Coventry
* WL - Oxford
* WM - Liverpool
* WN - Swansea
* WO - Cardiff
* WP - Worcester
* WQ - unused
* WR - Leeds
* WS - Bristol
* WT - Leeds
* WU - Leeds
* WV - Brighton
* WW - Leeds
* WX - Leeds
* WY - Leeds
* WZ - Belfast

* X - Northumberland
* XA -London unused since 1974
* XB -London unused since 1974
* XC -London unused since 1974
* XD -London unused since 1974
* XE -London unused since 1974
* XF -London unused since 1974
* XG - Middlesbrough, but unused since 1974
* XH -London unused since 1974
* XI - Belfast
* XJ -London unused since 1974
* XK -London unused since 1974
* XL -London unused since 1974
* XM -London unused since 1974
* XN -London unused since 1974
* XO -London unused since 1974
* XP - temporary plates for vehicles being exported to Europeミ the first letter of the triplet indicates the month, with 1=Jan
* XQ - unused since 1974
* XR -London unused since 1974
* XS -Paisly unused since 1974
* XT -London unused since 1974
* XU -London unused since 1974
* XV -London unused since 1974
* XW -London unused since 1974
* XX -London unused since 1974
* XY -London unused since 1974
* XZ - County Armagh

* Y - Somerset
* YA - Taunton
* YB - Taunton
* YC - Taunton
* YD - Taunton
* YE - London (Central)
* YF - London (Central)
* YG - Leeds
* YH - London (Central)
* YI - County Dublin
* YJ - Brighton
* YK - London (Central)
* YL - London (Central)
* YM - London (Central)
* YN - London (Central)
* YO - London (Central)
* YP - London (Central)
* YQ - unused
* YR - London (Central)
* YS - Glasgow
* YT - London (Central)
* YU - London (Central)
* YV - London (Central)
* YW - London (Central)
* YX - London (Central)
* YY - London (Central)
* YZ - County Londonderry

* Z - County Dublin
* ZA - Dublin
* ZB - County Cork
* ZC - Dublin
* ZD - Dublin
* ZE - County Dublin
* ZF - Cork
* ZG - County Dublin
* ZH - Dublin
* ZI - unused
* ZJ - Dublin
* ZK - County Cork
* ZL - County Dublin
* ZM - County Galway
* ZN - County Meath
* ZO - County Dublin
* ZP - County Donegal
* ZQ - unused
* ZR - County Wexford
* ZS - County Dublin
* ZT - County Cork
* ZU - County Dublin
* ZV - County Dublin
* ZW - County Kildare
* ZX - County Kerry
* ZY - County Louth
* ZZ - unused

There are also 3-digit Local Vehicle Licensing Office codes, which can be seen as the fifth, sixth & seventh digits of those new car tax discs that have a twelve-digit number printed at the bottom:

* 300 -
* 301 - Aberdeen
* 302 - Ayr
* 303 - Dumfries
* 304 - Dundee
* 305 - Edinburgh
* 306 - Glasgow
* 307 - Inverness
* 308 - Keith
* 309 - Kirkwall
* 310 - Lerwick
* 311 - Oban
* 312 - Selkirk
* 313 - Stirling
* 314 - Stornoway
* 315 - Stanraer
* 316 - Wick
* 317 -
* 318 -
* 319 -
* 320 - Durham
* 321 - Middlesbrough
* 322 - Newcastle upon Tyne
* 323 -
* 324 - Barrow in Furness
* 325 - Bolton
* 326 - Carlisle
* 327 - Kendal
* 328 - Liverpool
* 329 - Manchester
* 330 - Preston
* 331 - Warrington
* 332 -
* 333 - Grimsby
* 334 - Huddersfield
* 335 - Hull
* 336 - Leeds
* 337 - Sheffield
* 338 - York
* 339 -
* 340 - Boston
* 341 - Leicester
* 342 - Lincoln
* 343 - Nottingham
* 344 -
* 345 - Cambridge
* 346 - Ipswich
* 347 - Norwich
* 348 - Peterborough
* 349 -
* 350 - London Central
* 351 - London North East
* 352 - London North West
* 353 - London South West
* 354 - London South East
* 355 -
* 356 -
* 357 - Brighton
* 358 - Canterbury
* 359 - Chelmsford
* 360 - Guildford
* 361 - Hastings
* 362 - Luton
* 363 - Maidstone
* 364 - Newport (IoW)
* 365 - Northamptom
* 366 - Oxford
* 367 - Portsmouth
* 368 - Reading
* 369 -
* 370 - Barnstaple
* 371 - Bournemouth
* 372 - Bristol
* 373 - Exeter
* 374 - Gloucester
* 375 - Plymouth
* 376 - Salisbury
* 377 - Swindon
* 378 - Taunton
* 379 - Truro
* 380 -
* 381 - Birmingham
* 382 - Coventry
* 383 - Dudley
* 384 - Stoke on Trent
* 385 - Worcester
* 386 -
* 387 -
* 388 -
* 389 -
* 390 - Aberystwyth
* 391 - Bangor
* 392 - Cardiff
* 393 - Chester
* 394 - Haverfordwest
* 395 - Hereford
* 396 - Shrewsbury
* 397 - Swansea
* 398 -
* 399 - DVLA (Driver & Vehicle Licensing Agency)