551 Coast Regiment RA was formed as 13 Coast Artillery Group RA at Dungeness with four batteries, in October 1940. It was re-designated 551 Coast Regiment RA in June 1941. RHQ was disbanded in April 1944 with 340 Battery joining 519 Coast Regiment RA (TA) and the remainder joining 520 Coast Regiment RA (TA).
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 13 Coast Artillery Group | Dungeness, Kent, UK | |
| Oct 40 |  |
Eastern Command | Dungeness, Kent, UK |
| Jun 41 | Became 551 Coast Regiment | New Romney, Kent , UK | |
| Nov 42 | Home Forces | Lydd, Kent, UK | |
| Apr 44 | Disbanded |
Batteries
| Oct 40 | 358 (St Mary’s Bay), 374 (Pett Level), 415, 416 |
| Jan 41 | 358, 374, 415, 416, 423 |
| Mar 41 | 213, 358, 374, 415, 416 |
| Oct 41 | 213, 333, 336, 358, 374 |
| Nov 41 | 194, 213, 333, 336, 341, 358, 374 |
| Jun 42 | 194, 230, 333, 335, 336, 340, 374 |
| Feb 43 | 194, 230, 335, 340, 374, 415, 416 |