140 (5th London) Field Regiment RA (TA) was formed in May 1939 at Clapham Common with two batteries as a duplicate of 92 (5th London) Field Regiment. A third battery was raised in January 1941 at Bournemouth. On return from France the Regiment re-equipped in Northern Command. 140 (5th London) Field Regiment RA (TA) converted to 140 Medium Regiment in September 1943. Post war the Regiment went into suspended animation in February 1945 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 |  |
London District | Clapham, London, UK |
| Nov 39 |  |
1 Corps | France |
| May 40 | Home Forces | UK | |
| Dec 40 |  |
5 Corps | Bournemouth, Dorset, UK |
| Nov 42 |  |
1 Army | N Africa |
| Jul 43 |  |
Allied Forces HQ | N Africa |
| Aug 43 | Became 140 Medium Regiment |
Batteries
| May 39 | 366 (10th London), 367 (11th London) |
| Jan 41 | 366, 367, 504 |
| Jun 41 | 367, 504 – 366 Battery independent to Iceland |
| Sep 41 | 367, 504, 518 |
| Sep 43 | 367 & 518 converted to Medium Batteries 504 converted to Heavy Battery in 75 Heavy Regiment |
Equipment
| Nov 39 | 18 pdr Guns |
| Dec 40 | 25 pdr Mk2 |
| 1942 | 367 Battery – 25 pdr Self Propelled Bishop, 504 & 518 25 pdrs |