Key
| Heavy Anti-Aircraft Site |  | Airfield |  |
| Site No. | Name | OS Grid Reference |
| HO1 | Kenley: Warlingham | TQ 341 592 |
| HO3 | Biggin Hill: Cudham | TQ 437 587 |
| HO6 | Redhill | TQ 304 461 |
Gun Strengths
Battle of Britain & the Blitz
| Dates | RAF Biggin Hill 3 inch | RAF Kenley 3 inch |
| May-Aug 40 | 4 | 0 |
| Sep 40 | 8 | 0 |
| Aug-Dec 40 | 4 | 4 |
| Jan-Mar 41 | 4 | 3 |
| Apr-May 41 | 4 | 4 |