31 Anti-Aircraft Brigade served in Anti-Aircraft Command until coming under 21 Army Group in February 1944. It moved to France in October 1944 going to Brussels as a Training and Trials unit. It set up a practice camp for Searchlight Radar operators and began trials on using the Radar to track mortars. During this period the Brigade’s Regiments were dispersed. In April 1945, 31 Anti-Aircraft Brigade commanded occupation troops and coastal defences in Friesland.
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.
| Nov 36 | Formed Retford, Nottinghamshire as
31 (North Midland) Anti-Aircraft Group |  | 2 Anti-Aircraft Division |
| Apr 39 | York as 31 (North Midland) Anti-Aircraft Brigade |  | 7 Anti-Aircraft Division |
| Nov 40 | Yorkshire & North Lincolnshire |  | 10 Anti-Aircraft Division |
| Oct 42 | North East England |  | 5 Anti-Aircraft Group |
| Aug 43 | Became a Searchlight Brigade | | 5 Anti-Aircraft Group |
| Feb 44 | Tadcaster, Yorkshire |  | 21 Army Group |
| Jun 44 | Addlestone, Surrey | | 21 Army Group |
Order of Battle November 1936
| 66 (Leeds Rifles, The West Yorkshire Regiment) Anti-Aircraft Brigade (184, 185, 186, 197 Batteries) |
| 67 (The York & Lancaster Regiment) Anti-Aircraft Brigade (187, 188, 189, 198 Batteries) |
| 43 (The Duke of Wellington’s Regiment) Anti-Aircraft Battalion RE (TA) (370, 371, 372, 373 Companies) – Searchlights |
| 46 (The Lincolnshire Regiment) Anti-Aircraft Battalion RE (TA) (382, 383, 384, 385 Companies) – Searchlights |
Order of Battle September 1939
| 66 (Leeds Rifles, The West Yorkshire Regiment) Anti-Aircraft Regiment |
| 96 Anti-Aircraft Regiment (186, 287, 294, 295 Batteries) |
| 43 (The Duke of Wellington’s Regiment) Anti-Aircraft Battalion RE (TA) – Searchlights |
| 49 (West Yorkshire Regiment) Anti-Aircraft Battalion RE (TA) – Searchlights |
Order of Battle 1940-41
| 87 Heavy Anti-Aircraft Regiment (278, 279, 280 Batteries) |
| 38 Light Anti-Aircraft Regiment (278, 279, 280 Batteries) |
| 71 Light Anti-Aircraft Regiment (210, 211, 216 Batteries) |
| 43 (The Duke of Wellington’s Regiment) Searchlight Regiment (370, 371, 372, 373 Batteries) |
| 49 (West Yorkshire Regiment) Searchlight Regiment (395, 396, 397, 398 Batteries) |
| 54 (1/5 Bn Durham Light Infantry) Searchlight Regiment (411, 412, 413, 547 Batteries) |
Order of Battle 1941-43
| 12 Heavy Anti-Aircraft Regiment (4, 18, 203, 249 Batteries) – Joined August 1942 |
| 128 Heavy Anti-Aircraft Regiment (287, 309, 407, 436 Batteries) – Joined August & left November 1942 |
| 182 (Mixed) Heavy Anti-Aircraft Regiment (588, 592, 594, 615 (M) Batteries) – Joined October 1942, left May 1943 |
| 71 Light Anti-Aircraft Regiment (192, 210, 211, 216, 464 Batteries) – Left June 1942 |
| 114 Light Anti-Aircraft Regiment (372, 373, 374, 375 Batteries) – Joined May & left October 1942 |
| 142 Light Anti-Aircraft Regiment (374, 398, 465, 483 Batteries) – Joined October 1942, left April 1943 |
| 30 (Surrey) Searchlight Regiment (318, 323, 567 Batteries) Joined October 1941, left January 1942 |
| 41 (5th North Staffordshire Regiment) Searchlight Regiment (363, 364, 365 Batteries) Joined May 1943 |
| 42 (Robin Hoods, Sherwood Foresters) Searchlight Regiment (366, 367, 368, 369 Batteries) Joined May 1943 |
| 43 Searchlight Regiment (370, 371, 372, 373 Batteries) Left March 1943 |
| 49 Searchlight Regiment (395, 396, 397, 398 Batteries) |
| 54 (1/5 Bn Durham Light Infantry) Searchlight Regiment (411, 412, 413, 547 Batteries) |
| 17 AA Z Regiment (170, 206, 207, 212, 225 Batteries) |
Order of Battle 1943-44
| 41 (5th North Staffordshire Regiment) Searchlight Regiment (363, 364, 365 Batteries) |
| 42 (Robin Hoods, Sherwood Foresters) Searchlight Regiment (366, 367, 368, 369 Batteries) |
| 49 Searchlight Regiment (395, 396, 397, 398 Batteries) |
| 54 (1/5 Bn Durham Light Infantry) Searchlight Regiment (411, 412, 413, 547 Batteries) |
Order of Battle 1944
| 41 (5th North Staffordshire Regiment) Searchlight Regiment |
| 42 (Robin Hoods, Sherwood Foresters) Searchlight Regiment |
| 54 (1/5 Bn Durham Light Infantry) Searchlight Regiment |
| 64 (Essex Regiment) Searchlight Regiment (Later replaced by 58 Searchlight Regiment) |
