| Airdrie and Shotts |
|
| Aldershot |
Full name (in Craig 3,4) Hampshire, Aldershot |
| Aldridge-Brownhills |
|
| Altrincham |
Full name (in Craig 2,3) Cheshire, Altrincham |
| Altrincham and Sale |
|
| Altrincham and Sale West |
|
| Alyn and Deeside |
|
| Amber Valley |
|
| Andover |
Full name (in Craig 2) Hampshire, Andover |
| Anglesey |
Renamed Ynys Mon 1983 |
| Angus |
|
| Angus East |
|
| Angus North and Mearns |
|
| Angus South |
|
| Antrim |
Constituency of same name also existed 1922-1950. |
| Antrim |
Constituency of same name also existed 1832-1885. |
| Antrim East |
Constituency of same name also existed 1885-1922. |
| Antrim East |
Constituency of same name continued after 1922 |
| Antrim Mid |
|
| Antrim North |
Constituency of same name continued after 1922 |