58 (Middlesex) Searchlight Regiment RA (TA) formed in August 1940 by the transfer of 58 (Middlesex) Anti-Aircraft Battalion Royal Engineers (TA) to the RA. The Regiment served in Anti-Aircraft Command until converted to Infantry. 58 (Middlesex) Searchlight Regiment RA (TA) was converted in November 1944 to 58 Garrison Regiment RA and then to 611 Infantry Regiment RA in February 1945. It was re-constituted as 593 (Middlesex) (Mixed) Heavy 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.
| Aug 40 | Formed from 58 Anti-Aircraft Battalion Royal Engineers |
Harrow, Middlesex, UK | |
| Aug 40 |  |
2 Anti-Aircraft Division, 32 Anti-Aircraft Brigade | East Midlands, UK |
| Feb 43 |  |
5 Anti-Aircraft Group, 41 Anti-Aircraft Brigade | East Midlands, UK |
| Jul 43 | |
5 Anti-Aircraft Group, 57 Anti-Aircraft Brigade | East Midlands, UK |
| Jul 44 | |
Anti-Aircraft Command | Dungeness, Kent, UK |
| Nov 44 | Became 58 Garrison Regiment RA |
Batteries
| Aug 40 | 344, 425, 426 |
| Dec 40 | 344, 425, 426, 511 |
| Jan 42 | 344, 425, 426 |
| Apr 43 | 425, 426 |
| May 44 | 314, 425, 426 |
Equipment
| Jul 44 | Twin 3 inch Z rocket launchers |