75 (Middlesex) Light Anti-Aircraft Regiment RA (TA) was formed in February 1941 at Hanger Hill, Ealing, by conversion of 75 Searchlight Regiment. The Regiment moved to North Africa and took part in the invasion of Sicily. It served in Italy from October 1943. 75 (Middlesex) Light Anti-Aircraft Regiment RA (TA) was placed in suspended animation in September 1944 and re-constituted as 610 (Middlesex) Light Anti-Aircraft 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.
| Feb 41 | Formed from 75 Searchlight Regiment | Ealing, London, UK | |
| Feb 41 | Home Forces | UK | |
| Jan 43 | 76 Anti-Aircraft Brigade | UK | |
| Jun 43 |  |
Middle East Forces | N Africa |
| Jul 43 |  |
8 Army | Pachino, Sicily |
| Oct 43 |  |
Allied Forces HQ, 8 Anti-Aircraft Brigade | Brindisi, Italy |
| Dec 43 | |
Allied Forces HQ, 25 Anti-Aircraft Brigade | Brindisi, Italy |
| Sep 44 | Suspended animation |
Batteries
| Feb 41 | 232, 233, 234 |
| Dec 41 | 233, 234, 303 |
| Feb 42 | 233, 234, 303, 467 |
| Jul 42 | 233, 234, 303 |