| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Code |
Notes |
| AB | Two one off convoys of early date (one from August 1939!). |
| AB | Commenced in Sept 1942, Aden to Bombay. |
| ABF | The Fast, i.e. troopship, successor to AB, Aden to Bombay. |
| AC | A 1941 series, Alexandria to Cyrenaica i.e. Tobruk. |
| AG | Alexandria to Greece, a 1941 series. |
| AH | Durban to Beira. |
| AH | Augusta to Heel of Italy, post Sept 1943. |
| AJ | Aden to Colombo. J probably refers to Jaffna. |
| AK | Aden to Kilindini, commenced in 1942. |
| AKD | Aden to Kilindini and Durban. |
| AM | Chittagong to Madras. |
| AN | Aegean Northward, i.e. Alexandria to Piraeus 1940 & 1941. |
| AN | A Pacific series, Admiralty Islands to New Guinea. |
| AP | The early troop convoys UK to Egypt in mid 1940. |
| ARG | Boston to Argentia—USN convoys. |
| ARM | A local Mediterranean code, little used. |
| AS | Aegean Southward, i.e. Piraeus to Alexandria 1940 & 1941. |
| AS | America to Suez, convoys New York to Suez via Freetown in 1942. |
| AT | Alexandria to Tobruk commencing late 1941. |
| AT | USA to UK troopship series 1942-45. |
| ATM | Antwerp to Thames, a late 1944 & 1945 series. |
| AW | Aruba to Curacao (Willemstad) local tanker traffic. |
Converted from the original by kind permission of Mrs. Gill Hague.