558 Coast Regiment RA was formed as 20 Coast Artillery Group RA at Barnstaple with four batteries, in October 1940. It was re-designated 558 Coast Regiment RA in June 1941. RHQ and 229 Battery were disbanded in February 1943, the remaing batteries joining 546 Coast Regiment RA.
| Oct 40 | Formed as 20 Coast Artillery Group | Barnstaple, Devon, UK |
| Jun 41 | Became 558 Coast Regiment | |
| Feb 43 | Disbanded |
Batteries
| Oct 40 | 379, 398, 399, 400 |
| Apr 42 | 379, 398, 399 |
| May 42 | 379, 398 |
| Aug 42 | 364, 398 |
| Oct 42 | RHQ only |
