12 Heavy Anti-Aircraft Regiment RA was formed at Woolwich in February 1941. The Regiment was re-designated as 177 Heavy Anti-Aircraft Regiment RA(TA) in May 1944. 4 and 18 Batteries were re-numbered as 598 and 600 Batteries. At the same time, 177 Heavy Anti-Aircraft Regiment RA(TA) was re-designated as 12 Heavy Anti-Aircraft Regiment RA with 598 and 600 Batteries being re-numbered 4 and 18 Batteries. The Regiment was re-designated as 70 Heavy Anti-Aircraft Regiment RA in April 1947.
| Feb 41 | Formed with 1 Heavy & 1 Light Anti-Aircraft Battery | |
| Feb 41 | Home Forces | Woolwich. London, UK |
| Mar 41 | Iceland | Iceland |
| Jul 42 | Home Forces | UK |
| May 44 |
Became 177 Heavy Anti-Aircraft Regiment with 4, 18 177 HAA became 12 HAA Regt with 4, 18 (renumbered |
Batteries
| Feb 41 | 249, 52 LAA |
| Feb 41 | 4, 249, 52 LAA |
| Sep 41 | 4, 18, 203, 249, 52 LAA |
| Oct 41 | 4, 18, 203 |
| May 44 | 4, 18, 360 |
