British Armor Policy

[Fubar]

The Infantry tanks were meant just for supporting infantry assaults whilst the Cruiser class were never meant to engage enemy infantry so there was no need for HE shells.

... from Wikipedia

The infantry tank was a concept developed by the British in the years leading up to World War II. They were generally more heavily armoured compared to the lighter cruiser tanks, which would allow them to operate in close concert with infantry to help them break through heavily defended areas in the enemy lines. Once they had opened a gap, the cruisers were expected to exploit their higher speed and longer range to range far behind the front in order to cut lines of supply and communications. In more conventional terminology, the infantry tank was essentially a heavy tank, while the cruisers were either mediums, lights, or even armoured cars.