89 Searchlight Regiment RA(TA) was formed in March 1941 with four batteries, at Wellington, Somerset. It was converted in March 1942 to 133 Light Anti-Aircraft Regiment.
| Mar 41 | Formed | Wellington, Somerset, UK |
| Mar 41 | 60 Anti-Aircraft Brigade, 8 Anti-Aircraft Division | Bolham, Devon, UK |
| Oct 41 | 60 Anti-Aircraft Brigade, 8 Anti-Aircraft Division | Torridge, Devon, UK |
| Mar 42 | Became 133 Light Anti-Aircraft Regiment |
Batteries
| Mar 41 | 536, 541, 542, 543 |
| Dec 41 | 536, 541, 542 |
