55 (Durham Light Infantry) Searchlight Regiment RA (TA) formed in August 1940 by the transfer of 2/5th Battalion The Durham Light Infantry (55 Searchlight Regiment) (TA) to the RA. The Regiment served in Anti-Aircraft Command until early 1942 when it converted to Light Anti-Aircraft. It was converted to 113 Light Anti-Aircraft Regiment in January 1942. It was re-constituted as 590 (The Durham Light Infantry) Light Anti-Aircraft/Searchlight Regiment RA (TA) in January 1947.
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 38 | 2/5th Battalion Durham Light Infantry (55 Searchlight Regiment) |
West Hartlepool, Co Durham, UK | |
| Aug 40 |  |
Became RA – 7 Anti-Aircraft Division, 43 Anti-Aircraft Brigade |
North East England |
| Oct 41 | |
7 Anti-Aircraft Division, 57 Anti-Aircraft Brigade | North East England |
| Jan 42 | Became 113 Light Anti-Aircraft Regiment |
Batteries
| Aug 40 | 414, 415, 416 |
| Jan 41 | 414, 415, 416, 530 |