| Group | Squadron | Base | County | Arrived | Comments |
|---|---|---|---|---|---|
| 6 | 104 | Bassingbourn | Cambridgeshire | 03/09/39 | Blenheim I, 05/38. Anson I, 05/39. |
| 6 | 104 | Bicester | Oxfordshire | 18/09/39 | Blenheim IV, 11/39. Became 13 OTU, 08/04/40. |
| 4 | 104 | Driffield | Yorkshire | 01/04/41 | Reformed. Wellington II, 04/41. To Middle East, 14/02/42. |