1940
| 121 Officer Cadet Training Unit RA | Aldershot, Surrey Moved 1941 to Alton Towers, Staffordshire |
| 122 Officer Cadet Training Unit RA | Larkhill, Wiltshire |
| 123 Officer Cadet Training Unit RA | Catterick, Yorkshire |
| 124 Officer Cadet Training Unit (AA) RA Became a specialist Anti Aircraft OCTU in May 1940 |
Llandrindod Wells, Powys |
| 125 Officer Cadet Training Unit RA Jan 42 converted to Anti Tank OCTU. Unit disbanded Jun 44 |
Ilkley, Yorkshire From Sep 39 to July 40 the OCTU was at Filey on the Yorkshire coast |
| 133 Officer Cadet Training Unit (AA) RA In 1941 became 133 OCT Group taking under command 124 OCTU |
Shrivenham, Oxfordshire Jul 42 moved to Cardigan Bay (Tonfanau ?). Disbanded Dec 43 |