Formed as 1 Home Counties Brigade Royal Field Artillery (TF) in February 1920. It became 57 (Home Counties) Brigade RFA (TA) in 1921. It changed title again in June 1924 becoming 57 (Home Counties) Field Brigade RA (TA). 57 (Home Counties) Field Regiment RA (TA) was re-designated from 57 Field Brigade in November 1938 on a two battery basis. A third battery was raised in February 1941. 57 (Home Counties) Field Regiment RA (TA) was placed into suspended animation in February 1946 and reconstituted as 257 (Home Counties) Field 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.
| 3 Sep 39 |  |
44 (Home Counties) Infantry Division | Brighton, Sussex, UK |
| 14 Sep 39 | |
44 Infantry Division | Forrest Row, Sussex, UK |
| 24 Oct 39 | |
44 Infantry Division | Yeovil, Somerset, UK |
| Apr 40 | |
44 Infantry Division | St Pol, France |
| May 40 | |
44 Infantry Division | Escaut, France |
| May 40 | |
44 Infantry Division | Dunkirk, France |
| Jun 40 | |
44 Infantry Division | Pontefract, Yorkshire, UK |
| Mar 41 | |
44 Infantry Division | Sussex, UK |
| Jul 42 | |
44 Infantry Division | N Africa |
| Oct 42 | |
44 Infantry Division | Alamein, Egypt |
| Jan 43 |  |
5 Army Group RA, 8 Army | Medenine, Tunisia |
| Jul 43 | |
5 Army Group RA, 8 Army | Sicily |
| Sep 43 | |
5 Army Group RA, 8 Army | Italy |
| Nov 43 |  |
6 Army Group RA, 8 Army | River Sangro, Italy |
| Apr 44 | |
6 Army Group RA, 8 Army | Cassino, Italy |
| Apr 45 | |
6 Army Group RA, 8 Army | River Po, Italy |
Batteries
| 1921 | 225, 226, 227, 228 |
| Nov 38 | 225, 226 (Brighton) – 227 & 228 Batteries to 113 Field Regiment |
| Feb 41 | 225, 226, 440 |
| Jun 43 | 160, 225, 226 |
Equipment
| 1940 | 18/25 pdr Guns |