| L | Glamorganshire |
| LA | London (North-West) (used for London County Council before 1965) |
| LB | London (North-West) |
| LC | London (North-West) |
| LD | London (North-West) |
| LE | London (North-West) |
| LF | London (North-West) |
| LG | Chester |
| LH | London (North-West) |
| LJ | Bournemouth |
| LK | London (North-West) |
| LL | London (North-West) |
| LM | London (North-West) |
| LN | London (North-West) |
| LO | London (North-West) |
| LP | London (North-West) |
| LR | London (North-West) |
| LS | Edinburgh (Stirling until 1981) |
| LT | London (North-West) |
| LU | London (North-West) |
| LV | Liverpool |
| LW | London (North-West) |
| LX | London (North-West) |
| LY | London (North-West) |