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