Hmm, I disagree. Things are a bit more complicated than the way you seem to generalise. The British native tanks were (for the relevant period and according to Chamberlain & Ellis "Brit. and Amer. Tanks of WW2"):

* Light Tanks - IV, V, VI, Tetrach, Harry Hopkins

* Cruiser Tanks - A9, A10, A13, Covenanter, Crusader, Centaur, Cromwell, Challenger, Comet, Centurion

* Infantry Tanks - Matilda I, Matilda II, Valentine, Churchill

not counting numerous prototypes, variants, derivatives, etc.

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