Raised as 40 Brigade in 1900, it was re-designated as 12 Brigade Royal Field Artillery in May 1920. The Brigade changed from Royal Field Artillery to Royal Artillery in June 1924. The Regiment was re-designated as 12 Field Regiment RA from 12 Field Brigade RA in May 1938. In April 1939 it re-organised on a two battery basis. By November 1941 it had become three batteries. It was re-designated as 17 Medium Regiment RA in November 1943.
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.
|3 Sep 39||Scottish Command||Dunbar, East Lothian, UK|
|Nov 40||HQRA Malta||Malta|
|Mar 42||Middle East Forces||N Africa|
|Nov 43||Became 17 Medium Regiment|
|May 22||6, 23, 49, 91|
|Apr 39||6/23, 49/91|
|Nov 41||6, 23, 49/91|
|Nov 40||24 x 18/25 pdr Guns|