117 (7th London) Field Regiment RA (TA) was formed with two batteries in May 1939 as a duplicate of 64 Field Regiment. In January 1941 a third battery was formed at Tenby, South Wales. Two more batteries were added in early 1945 from the disbanded 173 Field Regiment. Post war 117 (7th London) Field Regiment RA (TA) went into suspended animation in March 1946 and was disbanded 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.
(Title authorised February 1942)
| May 39 |  |
2 (London) Infantry Division | Fulham, London, UK |
| Nov 40 | |
47 Infantry Division | Tenby, Pembrokeshire, UK |
| Aug 44 | Home Forces | UK | |
| Nov 44 | |
47 Infantry Division | UK |
Batteries
| May 39 | 255 (20th London), 256 (17th London) |
| Jan 41 | 255, 256, 482 |
| Jan 45 | 255, 256, 482 – 138 (Holding Battery) |
| May 45 | 156, 255, 256, 482 – 138 (Holding Battery) |