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| Postal Code | |
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| A B C D E F G H I L M N P R S T U |
| Country | From | To | Customs airport | Code |
| United Kingdom | AB | Aberdeen | ABZ | |
| AL | St. Albans | LHR | ||
| B | Birmingham | BHX | ||
| BA | Bath | BRS | ||
| BB | Blackburn | MAN | ||
| BD | Bradford | LBA | ||
| BH | Bournemouth | LHR | ||
| BL | Bolton | MAN | ||
| BN | Brighton | LHR | ||
| BR | Bromley | LHR | ||
| BS | Bristol | BRS | ||
| BT | Belfast | BFS | ||
| CA | Carlisle | MAN | ||
| CB | Cambridge | LHR | ||
| SF | Cardiff | CWL | ||
| CH | Chester | MAN | ||
| CM | Chelmsford | LHR | ||
| CO | Colchester | LHR | ||
| CR | Croydon | LHR | ||
| CT | Canterbury | LHR | ||
| CV | Coventry | BHX | ||
| CV | Warwick | BHX | ||
| CW | Crewe | MAN | ||
| DA | Dartford | LHR | ||
| DD | Dundee | EDI | ||
| DE | Derby | EMA | ||
| DG | Dumfries | GLA | ||
| DH | Durham | MME | ||
| DL | Darlington | MME | ||
| DN | Doncaster | MAN | ||
| DT | Dorchester | LHR | ||
| DY | Dudley | BHX | ||
| EH | Bathgate | EDI | ||
| EH | Edinburgh | EDI | ||
| EH | Livingston | EDI | ||
| EN | Enfield | LHR | ||
| EX | Exeter | LHR | ||
| FK | Falkirk | GLA | ||
| FY | Blackpool | MAN | ||
| G | Glasgow | GLA | ||
| GL | Gloucester | BRS | ||
| GU | Guildford | LHR | ||
| HA | Harrow | LHR | ||
| HD | Huddersfield | MAN | ||
| HG | Harrogate | MAN | ||
| HP | Hemel Hempstead | LHR | ||
| HR | Hereford | BHX | ||
| HU | Hull | MAN | ||
| HX | Halifax | MAN | ||
| IG | Ilford | LHR | ||
| IP | Ipswich | LHR | ||
| IV | Inverness | GLA | ||
| KA | Kilmarnock | GLA | ||
| KT | Kingston/Thames | LHR | ||
| KW | Kirkwall | GLA | ||
| KY | Glenrothes | edi | ||
| KY | Kirkcaldy | EDI | ||
| L | Liverpool | LPL | ||
| LA | Lancaster | MAN | ||
| LD | Llandridnod Wells | CWL | ||
| LE | Leicester | BHX | ||
| LL | Llandudno | MAN | ||
| LN | Lincoln | EMA | ||
| LS | Leeds | LBA | ||
| LU | Luton | LHR | ||
| M | Manchester | MAN | ||
| ME | Medway | LHR | ||
| MK | Milton Keynes | LHR | ||
| ML | Motherwell | GLA | ||
| NE | Newcastle up'n Tyne | NCL | ||
| NG | Nottingham | EMA | ||
| NN | Northampton | BHX | ||
| NP | Newport | CWL | ||
| NR | Norwich | NWI | ||
| OL | Oldham | MAN | ||
| OX | Oxford | LHR | ||
| PA | Paisley | GLA | ||
| PE | Petersborough | LHR | ||
| PH | Perth | EDI | ||
| PL | Plymouth | LHR | ||
| PO | Portsmouth | LHR | ||
| PR | Preston | MAN | ||
| RG | Basingstoke | LHR | ||
| RG | Bracknell | LHR | ||
| RG | Reading | LHR | ||
| RH | Crawley | LHR | ||
| RH | Gatwick | LHR | ||
| RH | Redhill | LHR | ||
| RM | Romford | LHR | ||
| S | Sheffield | MAN | ||
| SA | Swansea | CWL | ||
| SG | Stevenage | LHR | ||
| SK | Stockport | MAN | ||
| SL | Slough | LHR | ||
| SM | Sutton | LHR | ||
| SN | Swindon | BRS | ||
| SO | Southampton | LHR | ||
| SP | Salisbury | LHR | ||
| SR | Sunderland | NCL | ||
| SS | Southend-on-Sea | LHR | ||
| ST | Stoke-on-Trent | MAN | ||
| SY | Shrewsbury | BHX | ||
| TA | Taunton | BRS | ||
| TD | Galashiels | EDI | ||
| TD | Hawick | EDI | ||
| TF | Telford | BHX | ||
| TN | Tunbridge Wells | LHR | ||
| TO | Torquay | BRS | ||
| TR | Truro | BRS | ||
| TS | Cleveland | MME | ||
| TW | Twickenham | LHR | ||
| UB | Southall | LHR | ||
| WA | Warrington | MAN | ||
| WD | Watford | LHR | ||
| WF | Wakefield | LBA | ||
| WN | Wigan | MAN | ||
| WR | Worcester | BHX | ||
| WS | Walshall | BHX | ||
| WV | Wolverhampton | BHX | ||
| YO | York | LBA | ||
| ZE | Lerwick | GLA |
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