31 Light Anti-Aircraft Regiment RA(TA) was formed at Perth, in August 1939. It went into suspended animation in November 1945 and re-constituted as 531 Light Anti-Aircraft/Searchlight Regiment RA(TA) in January 1947.
| Aug 39 | Scottish Command | Perth, Perthshire, UK |
| Jul 43 | 8 Army | Sicily |
| Sep 43 | 8 Army | Italy |
| Nov 45 | Suspended animation |
Batteries
| Sep 39 | 61, 101 |
| Mar 41 | 61, 101, 224 |
| Feb 42 | 61, 101, 224, 447 |
| Jul 42 | 61, 101, 224 |
