[CharlesM]

Other sources include the later Armour in Profile on Cromwell and Comet, and David Fletcher and Richard Harley's Osprey New Vanguard # 104 on the Cromwell series. This, and an article appearing in Tankette many years ago emphasise the rather haphard upgrading of Centaurs and earlier Cromwells into later marks. Not all Cromwells in NW Europe were armoured to later Mk VII standards.

Let me know if you want anything further.