| Group | Squadron | Base | County | Arrived | Comments |
|---|---|---|---|---|---|
| 6 | 166 | Leconfield | Yorkshire | 03/09/39 | Whitley I, 06/39. |
| 6 | 166 | Abingdon | Berkshire | 17/09/39 | Whitley III, 12/39. Became No.10 OTU, 08/04/40. |
| 1 | 166 | Kirmington | Lincolnshire | 27/01/43 | Reformed. Wellington III, 01/43. Wellington X, 02/43. Lancaster I, 09/43. Lancaster III, 09/43. |