81 Searchlight Regiment RA (TA) was formed in November 1940 with two batteries, at Kes, Truro. The Regiment served in Anti-Aircraft Command until becoming Light Anti-Aircraft. 81 Searchlight Regiment RA (TA) was converted to 131 Light Anti-Aircraft Regiment in March 1942.
Illustrations of the formation badges under which a unit served or supported are given. This is no guarantee that the unit used this formations badge.
| Nov 40 | Formed | Truro, Cornwall, UK | |
| Nov 40 |  |
8 Anti-Aircraft Division, 55 Anti-Aircraft Brigade | Truro, Cornwall, UK |
| Apr 41 | |
8 Anti-Aircraft Division, 55 Anti-Aircraft Brigade | Mortehoe, Devon, UK |
| Dec 41 |  |
6 Anti-Aircraft Division, 29 Anti-Aircraft Brigade | Clacton, Essex, UK |
| Mar 42 | Became 131 Light Anti-Aircraft Regiment |
Batteries
| Nov 40 | 482, 509 |
| Apr 41 | 482, 509, 545, 555 |