the italian M13 tank family was enough good for fight the british cruiser tank, also if the italians was slowest, only the late Crusader give a good advantage on they (it's true that 2 pdr it's a best ATG of 47mm but this was not important saw the armour of cruiser tank, and the 47 give antiinfantry capability). if you can out italian medium with ATR you can make same with british cruiser.