566 (Devon) Coast Regiment RA (TA) was formed from part of Devon Heavy Regiment RA (TA) at Plymouth with three batteries, in April 1941. It was re-designated 566 (Devon & Cornwall) Coast Regiment RA (TA) in June 1945. The Regiment was placed in suspended animation in January 1946 and reconstituted as 407 (Devon) Coast Regiment RA (TA) in January 1947.
Illustrations of the formation badges under which a unit served or supported are given. This is no guarantee that the unit used this formations badge.
| Apr 41 | Formed from part of Devon Heavy Regiment | Plymouth, Devon, UK | |
| Apr 41 |  |
8 Corps | Plymouth, Devon, UK |
| Dec 42 | Drakes Fire Command | Plymouth, Devon, UK | |
| Jan 43 |  |
Southern Command | |
| Jun 45 | Re-designated 566 (Devon & Cornwall) Coast Regiment | ||
| Jan 46 | Suspended animation |
Batteries
| Apr 41 | 159 (Drake’s Island), 160 (Mount Batten), 161 (Western Kings) |
| Apr 42 | 159, 160, 161, 195 (Drake’s Island), 196 |
| Dec 42 | 159, 160, 161, 195, 196 – 3 Coast Observer Detachment |
| Apr 43 | 137, 156, 159, 160, 161, 195, 196 – 3 Coast Observer Detachment |
| May 43 | 137, 156, 159, 161, 195, 196, 443 (Mount Batten) – 3 Coast Observer Detachment |
| Jul 43 | 137, 156, 159, 161, 195, 196, 443 |
| Apr 44 | 137, 156, 159, 161, 162, 163, 164, 195, 196, 443 |
| Jun 45 | 137, 156, 162, 163, 164, 195 |