57 (Lowland) Medium Regiment RA (TA) was re-designated from 57 Medium Brigade with two batteries in November 1938. The Regiment was converted to 51 (Lowland) Heavy Regiment RA (TA) in September 1939 with four batteries.
| Nov 38 | Home Forces | Edinburgh, UK |
| Sep 39 | Became 51 Heavy Regiment |
Batteries
| Nov 38 | 225, 226 (City of Edinburgh) |