County Distinguishing Letters
By Insignia
| A | Anglesey | KT | Kent |
| AB | Aberdeenshire and City of Aberdeen | L | Lincolnshire (Lindsey) |
| ABK | Aberdeenshire (Kincardineshire Bn) | LEI | Leicestershire |
| ANG | Angus | LF | Lancashire (21, 22, 27, 41-43, 55, 60 and 64 Bns) |
| ARG | Argyllshire | LK | Lanarkshire |
| AYR | Ayrshire | LON | County of London |
| BDF | Bedfordshire | LR | Lancashire |
| BHM | Warwickshire (Birmingham) | M | Merioneth and Montgomery |
| BNF | Banffshire | MAN | Lancashire (23, 25, 26, 44-51, 56, 61 and 63 Bns) |
| BR | Brecknockshire | ML | Midlothian |
| BRX | Berkshire | MON | Monmouthshire |
| BUX | Buckinghamshire | MRY | Moray |
| CA | Caithness | MX | Middlesex |
| CAM | Cambridgeshire | ND | Northumberland |
| CC | Caernarvonshire | NK | Norfolk |
| CDN | Cardiganshire | NN | Northamptonshire |
| CH | Cheshire | NRY | North Riding of Yorkshire |
| CLN | Clackmannanshire | NS | North Staffordshire |
| CO | Cornwall | NTS | Nottinghamshire |
| COL | City of London | ORK | Orkney |
| COV | Warwickshire (Coventry) | OXF | Oxfordshire |
| CRM | Carmarthenshire | PEM | Pembrokeshire |
| CT | Lincolnshire (Lincoln - County Town) | R | Ross-shire |
| CUM | Cumberland | R&B | Renfrewshire and Buteshire Bn |
| DBT | Dumbartonshire | REN | Renfrewshire |
| DDE | City of Dundee | R-L | Ross-shire (Lewis Bn) |
| DEN | Denbighshire | RR | Radnorshire |
| DFS | Dumfriesshire | RU | Rutland |
| DHM | Durham | SB | Scottish Border |
| DOR | Dorset | SF | Derbyshire |
| DVN | Devon | SFK | Suffolk |
| EHG | City of Edinburgh | SHR | Shropshire |
| EL | Lancashire (1-15, 28-32, 57-59 and 62 Bns) | SKR | Stewartry of Kirkcudbrightshire |
| EL | East Lothian | SOM | Somerset |
| ELY | Isle of Ely | SS | South Staffordshire |
| ER | East Riding of Yorkshire | STG | Stirlingshire |
| ESX | Essex | SU | Sutherland |
| F | Fife | SX | Sussex |
| F&D | Denbighshire (Den/Flint Bn) | SY | Surrey |
| FT | Flintshire | TAY | Perthshire |
| G | City of Glasgow) | TWD | Peeblesshire |
| GLN | Glamorganshire | UTP | Upper Thames Patrol (12 Berkshire Bn and 31 Middlesex Bn |
| GLS | Gloucestershire | WAR | Warwickshire |
| H | Hampshire & Isle of Wight | WES | Westmorland |
| HD | Lincolnshire (Holland) | WL | West Lancashire |
| HDS | Huntingdonshire | WL | West Lothian |
| HFD | Herefordshire | WNM | Wigtownshire (Machars Bn) |
| HTS | Hertfordshire | WNR | Wigtownshire (Rhinns Bn) |
| IOM | Isle of Man | WOR | Worcestershire |
| IN | Inverness-shire (Nairnshire Bn) | WR | West Riding of Yorkshire |
| INV | Inverness-shire | WTS | Wiltshire |
| K | Lincolnshire (Kesteven) | Z | Zetland |