The following are the index-marks in use in the United Kingdom:

ENGLAND AND WALES

ENGLAND AND WALES
Index-
Mark. Locale.
ALondon (also LB, LC and LN)
AASouthampton County Council
ABWorcestershire
ACWarwickshire
ADGloucestershire
AEBristol
AFCornwall
AHNorfolk
AJYorkshire, N. Riding
AKBradford
ALNottinghamshire
AMWiltshire
ANWest Ham
AOCumberland
APSussex, East
ARHertfordshire
ATKingston-on-Hull
AUNottingham
AWShropshire
AXMonmouthshire
AYLeicestershire
BLancashire
BASalford
BBNewcastle-on-Tyne
BCLeicester
BDNorthamptonshire
BELindsey
BFDorsetshire (also FX)
BHBuckinghamshire
BJSuffolk, East
BKPortsmouth
BLBerkshire
BMBedfordshire
BNBolton
BOCardiff
BPSussex, West
BRSunderland
BTYorkshire, East Riding
BUOldham
BWOxfordshire
BXCarmarthenshire
BYCroydon
CYorkshire, West Riding
CADenbighshire
CBBlackburn
CCCarnarvonshire
CDBrighton
CECambridgeshire
CFSuffolk, West
CHDerby
CJHerefordshire
CKPreston
CLNorwich
CMBirkenhead
CNGateshead
COPlymouth
CPHalifax
CRSouthampton Borough
CTKesteven
CUSouth Shields
CWBurnley
CXHuddersfield
CYSwansea
DKent
DAWolverhampton
DBStockport
DCMiddlesbrough
DEPembrokeshire
DFNorthampton Borough (also NH)
DHWalsall
DJSt. Helens
DKRochdale
DLIsle of Wight
DMFlintshire
DNYork
DOHolland, Lincs.
DPReading
DRDevonport
DUCoventry
DWNewport, Mon.
DXIpswich
DYHastings
EStaffordshire
EAWest Bromwich
EBIsle of Ely
ECWestmorland
EDWarrington
EEGrimsby
EFWest Hartlepool
EHHanley
EJCardiganshire
EKWigan
ELBournemouth
EMBootle
ENBury
EOBarrow-in-Furness
EPMontgomeryshire
ETRotherham
EUBreckonshire
EWHuntingdonshire
EXGreat Yarmouth
EYAnglesey
FEssex
FABurton-on-Trent
FBBath
FCOxford
FDDudley
FELincoln
FFMerionethshire
FHGloucester
FJExeter
FKWorcester
FLPeterborough
FMChester
FNCanterbury
FORadnorshire
FPRutlandshire
FRBlackpool
FTTynemouth
FXDorsetshire (also BF)
FYSouthport
HMiddlesex
HASmethwick
JDurham, County
KLiverpool
LGlamorganshire
LBLondon (also A)
LC
LN
MCheshire
MNIsle of Man
NManchester
NHNorthampton (also DF)
OBirmingham
PSurrey
RDerbyshire
TDevonshire
ULeeds
WSheffield
XNorthumberland
YSomersetshire

SCOTLAND

All cars bearing on their index-marks the letter S can, at a glance, be put down as Scottish, for Scotland alone has a right to the use of this letter:

Index-
Mark. Locale.
ASNairnshire
BSOrkney
DSPeeblesshire
ESPerthshire
GGlasgow
HSRenfrewshire
JSRoss and Cromarty
KSRoxburghshire
LSSelkirkshire
MSStirlingshire
NSSutherlandshire
OSWigtownshire
PSShetland
RSAberdeen City
SEdinburgh
SAAberdeen County
SBArgyllshire
SDAyrshire
SEBanffshire
SHBerwickshire
SJButeshire
SKCaithness-shire
SLClackmannanshire
SMDumfriesshire
SNDumbartonshire
SOElginshire
SPFifeshire
SRForfarshire
SSHaddingtonshire
STInverness-shire
SUKincardineshire
SVKinross-shire
SWKircudbrightshire
SXLinlithgowshire
SYMidlothian
TSDundee
USGovan
VLanarkshire
VSGreenock
WSLeith
XSPaisley
YSPartick

IRELAND

The inclusion of the letter I on a car’s index-mark stamps that car at once as Irish, for the use of this letter is confined to Ireland: