122 Heavy Anti-Aircraft Regiment RA (TA) was formed at Edgbaston in February 1941. The Regiment Served in Anti-Aircraft Command for the entire war. 122 Heavy Anti-Aircraft Regiment RA (TA) was disbanded in October 1945.
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.
| Feb 41 | Formed | Edgbaston, Birmingham, UK | |
| Feb 41 |  |
11 Anti-Aircraft Division, 34 Anti-Aircraft Brigade | Birmingham, UK |
| Dec 41 | |
11 Anti-Aircraft Division, 67 Anti-Aircraft Brigade | Birmingham, UK |
| Dec 41 | |
11 Anti-Aircraft Division, 68 Anti-Aircraft Brigade | Birmingham, UK |
| Jul 42 |  |
Unbrigaded | UK |
| Sep 42 |  |
Orkney & Shetland Defences (OSDEF) | Orkney, UK |
| Feb 44 | |
6 Anti-Aircraft Group, 30 Anti-Aircraft Brigade | UK |
| May 44 | |
3 Anti-Aircraft Group | UK |
| Aug 44 | |
2 Anti-Aircraft Group, 102 Anti-Aircraft Brigade | South coast, England |
| Sep 44 | |
?? | UK |
| Mar 45 | |
9 Anti-Aircraft Group, 5 Anti-Aircraft Brigade | East Anglia, UK |
Batteries
| Feb 41 | 397, 400, 401 |
| Oct 41 | 397, 400, 401, 453 |
| Feb 44 | 397, 400, 401 |
Gun Sites Occupied
400 Battery
| Dates | Gun Sites | Comments | Gun Defended Area |
| Sep 42 – Sep 43 | H4 & H5 | On Hoy | Scapa |
401 Battery
| Dates | Gun Sites | Comments | Gun Defended Area |
| Sep 42 – Sep 43 | H1 & H3 | On Hoy | Scapa |