89 Searchlight Regiment RA (TA) was formed in March 1941 with four batteries, at Wellington, Somerset. It served with 60 Anti-Aircraft Brigade in Anti-Aircraft Command for 12 months before converting to Light Anti-Aircraft. 89 Searchlight Regiment RA (TA) was converted in March 1942 to 133 Light Anti-Aircraft Regiment.
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 41 | Formed | Wellington, Somerset, UK | |
| Mar 41 |  |
8 Anti-Aircraft Division, 60 Anti-Aircraft Brigade | Bolham, Devon, UK |
| Oct 41 | |
8 Anti-Aircraft Division, 60 Anti-Aircraft Brigade | Torridge, Devon, UK |
| Mar 42 | Became 133 Light Anti-Aircraft Regiment |
Batteries
| Mar 41 | 536, 541, 542, 543 |
| Dec 41 | 536, 541, 542 |