6 Coast Regiment RA was formed by re-designation of 6 Heavy Regiment in Ceylon in December 1940. The Diamond Hill, Elephant and Fort Frederick works became the three Coast Batteries. The Regiment was re-designated as 1 Ceylon Coast Regiment in April 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.
| Dec 40 | Re-designation of 6 Heavy Regiment | ||
| Dec 40 |  |
Ceylon Defences | Trincomalee, Ceylon (Sri Lanka) |
Batteries
| Dec 40 | 14 Heavy Anti-Aircraft, 15 Coast, 18 Coast |
| Mar 42 | 15 Coast, 18 Coast |
| Oct 43 | 15, 18, 462, 463, 464 Coast Batteries, 601 Field Battery |
| Jan 45 | 15, 18, 462, 463, 464 Coast Batteries |
Equipment
| Jan 42 | 2 x 9.2 inch & 3 x 6 inch Guns |
| Jun 44 | 464 Bty – 5.25 inch Anti-Aircraft/Coast Guns |