| Group | Squadron | Base | County | Arrived | Comments |
|---|---|---|---|---|---|
| 12 | 121 | Kirton-in-Lindsey | Lincolnshire | 14/05/41 | Reformed. Hurricane I, 05/41. Hurricane IIb, 07/41. Spitfire IIa, 10/41. Spitfire Vb, 11/41. |
| 11 | 121 | North Weald | Essex | 16/12/41 | |
| 11 | 121 | Rochford | Essex | 03/06/42 | |
| 11 | 121 | Debden | Essex | 23/09/42 | Became 335th Squadron, 4th FG/8th AF 29/09/42. |