543 Coast Regiment RA was formed as 3 Coast Artillery Group RA at Dundee with two batteries, in October 1940. It was re-designated 543 Coast Regiment RA in June 1941. RHQ was disbanded in April 1944 with 242 Battery placed in suspended animation and 143 & 303 Batteries joining 4 Coast Training Regiment RA.
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.
| Oct 40 | Formed as 3 Coast Artillery Group | Dundee, UK | |
| Oct 40 |  |
Scottish Command | Dundee, UK |
| Jun 41 | Became 543 Coast Regiment | Dundee, UK | |
| Apr 44 | Disbanded |
Batteries
| Oct 40 | 307, 308 |
| Apr 41 | 244, 307, 308 |
| Jul 41 | 143, 244, 307 |
| Mar 42 | 143, 242 (South Sutor), 303 (Wick) |