131 Light Anti-Aircraft Regiment RA (TA) was converted in March 1942 from 81 Searchlight Regiment. The Regiment spent its entire service in the UK. It was a part of Anti-Aircraft Command for the whole period serving mainly in the South East of England apart from a brief spell in Scotland in mid 1942. 131 Light Anti-Aircraft Regiment RA (TA) was stood down in May 1945 and started to slowly wind down, eventually disbanding in February 1946 at West Derby, Liverpool.
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.
| Mar 42 | Formed from 81 Searchlight Regiment | ||
| Jan 42 |  |
6 Anti-Aircraft Division , 29 Anti-Aircraft Brigade, for training | Colchester, Essex, UK |
| Mar 42 | |
6 Anti-Aircraft Division, 6 Anti-Aircraft Brigade – officially formed | UK |
| Jun 42 |  |
3 Anti-Aircraft Division, 51 Anti-Aircraft Brigade | Caithness, UK |
| Oct42 |  |
2 Anti-Aircraft Group, 71 Anti-Aircraft Brigade | Kent & Sussex coast, UK |
| Oct 44 | |
1 Anti-Aircraft Group, 57 Anti-Aircraft Brigade | Thames Estuary, UK |
| Nov 44 | |
9 Anti-Aircraft Group | Thames Estuary, UK |
| 20 May 45 | Regiment stood down |
Batteries
| Jan 42 | 432, 433, 434, 435 |
| Mar 44 | 432, 433, 434 |