| C | Yorkshire (West Riding) |
| CA | Chester (Denbighshire until 1974) |
| CB | Manchester (Blackburn until 1974; Bolton until 1981) |
| CC | Bangor |
| CD | Brighton |
| CE | Peterborough (Cambridge until 1981) |
| CF | Reading (West Suffolk until 1974) |
| CG | Bournemouth (Salisbury until 1980) |
| CH | Nottingham (Derby until 1974) |
| CJ | Gloucester (Hereford until 1981) |
| CK | Preston |
| CL | Norwich |
| CM | Liverpool (Birkenhead until 1974) |
| CN | Newcastle upon Tyne (Gateshead until 1974) |
| CO | Exeter (Plymouth until 1980) |
| CP | Huddersfield (Halifax until 1974) |
| CR | Southampton |
| CS | Glasgow (Ayr until 1981) |
| CT | Lincoln (Boston until 1981) |
| CU | Newcastle upon Tyne (South Shields until 1974) |
| CV | Truro |
| CW | Preston (Burnley until 1974) |
| CX | Huddersfield |
| CY | Swansea (SCY used for Isles of Scilly) |