Does anyone happen to know - How long the "Divisional anti tank regiment RAC" lasted? I doubt past about 1957-1960. How long the "Light regiment RA" lasted? These also seem to have been formed around 1950, to be equipped with the 4.2" mortar. I have no idea if this form of regiment lasted a long time with different equipment or not. PS also, I don't know the history of the 4.2" mortar in the army in the 1940s. I gather it was used by support regiments of some sort during the war. The file I was looking at made some reference to the mortar being "given" to the Royal Artillery, so I suppose originally it was not part of their responsibilities. A number of anti-tank regiments RA were converted to these light regiments RA.