| Group | Squadron | Base | County | Arrived | Comments |
|---|---|---|---|---|---|
| 54OTU | Church Fenton | Yorkshire | 21/12/40 | Formed from No. 4 OTU. | |
| 81 | 54OTU | Charterhall | Berwickshire | 01/05/42 | Blenheim. Beaufort I. Beaufighter. Wellington XVIII. Mosquito. |
| 81 | 54OTU | Winfield | Berwickshire | 01/05/42 | Satellite. Blenheim. Beaufort I. Beaufighter. Mosquito. Wellington. Hurricane. |