Article 2(5)
Article 4
| (1) | (2) |
|---|---|
| Ports of Registry | Distinguishing Letters |
| Aberystwyth | AB |
| Barnstaple | BE |
| Barrow | BW |
| Beaumaris | BS |
| Berwick-on-Tweed | BK |
| Bideford | BD |
| Blyth | BH |
| Boston | BN |
| Bridgwater | BR |
| Bristol | BL |
| Brixham | BM |
| Caernarvon | CO |
| Cardiff | CF |
| Cardigan | CA |
| Carlisle | CL |
| Chester | CH |
| Colchester | CK |
| Cowes | CS |
| Dartmouth | DH |
| Dover | DR |
| Exeter | E |
| Falmouth | FH |
| Faversham | F |
| Fleetwood | FD |
| Folkestone | FE |
| Fowey | FY |
| Gloucester | GR |
| Goole | GE |
| Great Yarmouth | YH |
| Grimsby | GY |
| Hartlepool | HL |
| Harwich | HH |
| Hull | H |
| Ipswich | IH |
| King’s Lynn | LN |
| Lancaster | LR |
| Littlehampton | LI |
| Liverpool | LL |
| Llanelly | LA |
| London | LO |
| Lowestoft | LT |
| Maldon | MN |
| Manchester | MR |
| Maryport | MT |
| Middlesbrough | MH |
| Milford Haven | M |
| Newcastle | NE |
| Newhaven | NN |
| Newport, Gwent | NT |
| Padstow | PW |
| Penzance | PZ |
| Plymouth | PH |
| Poole | PE |
| Portsmouth | P |
| Port Talbot | PT |
| Preston | PN |
| Ramsgate | R |
| Rochester | RR |
| Runcorn | RN |
| Rye | RX |
| St. Ives | SS |
| Salcombe | SE |
| Scarborough | SH |
| Scilly | SC |
| Shields. North | SN |
| Shields, South | SSS |
| Shoreham | SM |
| Southampton | SU |
| Stockton | ST |
| Sunderland | SD |
| Swansea | SA |
| Teignmouth | TH |
| Truro | TO |
| Weymouth | WH |
| Whitby | WY |
| Whitehaven | WA |
| Wisbech | WI |
| Workington | WO |
| (1) | (2) |
|---|---|
| Ports of Registry | Distinguishing Letters |
| Aberdeen | A |
| Alloa | AA |
| Arbroath | AH |
| Banff | BF |
| Borrowstoness | BO |
| Buckie | BCK |
| Burntisland | BU |
| Dundee | DE |
| Fraserburgh | FR |
| Grangemouth | GH |
| Granton | GN |
| Inverness | INS |
| Kirkcaldy | KY |
| Kirkwall | K |
| Leith | LH |
| Lerwick | LK |
| Methil | ML |
| Montrose | ME |
| Peterhead | PD |
| Wick | WK |
| (1) | (2) | (3) |
|---|---|---|
| Ports of Registry | Distinguishing Letters | Officer of the Secretary of State for Scotland, stationed at |
| Ballantrae | BA | Ayr |
| Broadford | BRD | Mallaig |
| Campbeltown | CN | Campbeltown |
| Castlebay, Barra | CY | Stornoway |
| Greenock | GK | Ayr |
| Oban | OB | Oban |
| Rothesay | RO | Campbeltown |
| Stornoway | SY | Stornoway |
| Tarbert, Loch Fyne | TT | Campbeltown |
| Ullapool | UL | Ullapool |
(Applicable only to fishing boats registered under Part I of the Merchant Shipping Act 1894.)
| (1) | (2) |
|---|---|
| Ports of Registry | Distinguishing Letters |
| Ardrossan | AD |
| Ayr | AR |
| Dumfries | DS |
| Glasgow | GW |
| (1) | (2) |
|---|---|
| Ports of Registry | Distinguishing Letters |
| Belfast | B |
| Coleraine | CE |
| (1) | (2) | (3) |
|---|---|---|
| Ports of Registry | Distinguishing Letters | Registrars |
| Guernsey | GU | Chief Officer of Customs and Excise |
| Jersey | J | Chief Officer of Customs and Excise |
| Castletown | CT | Officer of the Isle of Man Harbour Board (stationed at Douglas) |
| Douglas | DO | Officer of the Isle of Man Harbour Board |
| Peel | PL | Officer of the Isle of Man Harbour Board (stationed at Douglas) |
| Ramsey | RY | Officer of the Isle of Man Harbour Board (stationed at Douglas)” |