27 (London Electrical Engineers) Searchlight Regiment RA (TA) formed in August 1940 by the transfer of 27 (London Electrical Engineers) Anti-Aircraft Battalion Royal Engineers (TA) to the RA. The Regiment moved to Egypt in February 1941 and until October were split up. They continued to serve in the Middle East until June 1945. 27 (London Electrical Engineers) Searchlight Regiment RA (TA) was placed into suspended animation in June 1945 and re-constituted as 562 (London Electrical Engineers) (Mixed) 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.
| Aug 40 | Formed from 27 Anti-Aircraft Battalion Royal Engineers |
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| Aug 40 |  |
5 Anti-Aircraft Division, 47 Anti-Aircraft Brigade | Southampton, Hampshire, UK |
| Feb 41 |  |
Middle East Force, 2 Anti-Aircraft Brigade | Cairo, Egypt |
| May 41 | 304 Battery to Crete | Crete | |
| May 41 | 2 troops 306 Battery in Tobruk | Tobruk, Libya | |
| Oct 41 | Regiment re-united – 2 Anti-Aircraft Brigade | Egypt | |
| Jun 42 | Detachments at Tobruk & Alamein, remainder Egypt |
Libya & Egypt | |
| Jan 43 | RHQ & 2 batteries Egypt, 1 battery Tripoli, 1 battery Benghazi |
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| Jan 44 | Reduced to 2 batteries, Egypt & the Levant | ||
| Jun 45 | Suspended animation |
Batteries
| Aug 40 | 304, 305, 306, 390 |
| Jan 44 | 304, 305, 306, 390, 484 (attached) |
| Sep 44 | 304, 305, 306 |