86 Anti-Aircraft Regiment RA (TA) was raised in April 1939 at Finsbury, London. It was subsequently designated as 86 (Honourable Artillery Company) Anti-Aircraft Regiment (TA) in January 1939. In June 1940 it was re-designated as 86 (Honourable Artillery Company) Heavy Anti-Aircraft Regiment (TA). The Regiment was placed in suspended animation in April 1946. 86 (Honourable Artillery Company) Heavy Anti-Aircraft Regiment (TA) was reconstituted as 238 Royal Horse Artillery (Honourable Artillery Company) (TA) in January 1947. In July 1947 it was re-designated 2 Regiment Honourable Artillery Company (Heavy Anti-Aircraft) (TA).
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.
| Apr 39 |  |
1 Anti-Aircraft Division, 26 Anti-Aircraft Brigade | London, UK |
| Jan 42 | |
1 Anti-Aircraft Division, 49 Anti-Aircraft Brigade | Surrey, UK |
| Oct 42 |  |
6 Anti-Aircraft Group | Dumbarton, Dumbartonshire, UK |
| Dec 42 | Home Forces | Wethersfield, Essex, UK | |
| May 43 |  |
2 Army, 80 Anti-Aircraft Brigade | Blandford Dorset, UK |
| Jul 43 | |
2 Army, 80 Anti-Aircraft Brigade | Barrhead, Renfrewshire, UK |
| Dec 43 | |
2 Army, 80 Anti-Aircraft Brigade | Limpsfield, Surrey, UK |
| Apr 44 | |
2 Army, 80 Anti-Aircraft Brigade | Horsham, Sussex, UK |
| Jun 44 | |
2 Army, P Anti-Aircraft Assault Group – Juno Beach | Normandy, France |
| Sep 44 |  |
21 Army Group, 80 Anti-Aircraft Brigade | Rouen, France |
| Sep 44 | |
21 Army Group, 80 Anti-Aircraft Brigade | Dieppe, France |
| Oct 44 | |
21 Army Group, 80 Anti-Aircraft Brigade | Antwerp, Belgium |
Batteries
| Apr 39 | 273, 274, 275 |
| Feb 41 | 273, 274, 275, 383 |
| Sep 41 | 273, 274, 383, 446 |
| May 42 | 273, 274, 383 |
Gun Sites Occupied
273 Battery
| Dates | Gun Site | Gun Defended Area |
| Aug 39 |
ZE3 Asylum ZW3 Burnt Farm |
London IAZ |
| Oct 39 |
ZW3 Burnt Farm ZE1 Chadwell Heath |
London IAZ |
| Jan 42 |
SM3 Datchet Common SM7 Dorney Common |
Slough |
274 Battery
| Dates | Gun Site | Gun Defended Area |
| Aug 39 |
ZW5 Hyde Park ZE12 Southwark Park |
London IAZ |
| Oct 39 |
Handley Page & Fairey Aircraft Factories 20 Lewis MG’s each |
Radlett & Hayes |
| Jan 42 |
BM1 Fairmile BM5 Old Woking |
Brooklands |
275 Battery
| Dates | Gun Site | Gun Defended Area |
| Aug 39 |
ZS4 Bostall Heath ZS11 Brockley |
London IAZ |
| Oct 39 |
ZE3 Asylum |
London IAZ |
383 Battery
| Dates | Gun Site | Gun Defended Area |
| Jan 42 | SM9 West Drayton | Slough |
446 Battery
| Dates | Gun Site | Gun Defended Area |
| Jan-Jul 42 |
BM4 Woburn Park BM6 Weston Green |
Brooklands |