Here's the breakdown of how UKF medium armor worked; it's the inverse to all other factions. You best more expensive tanks are all mediums, you cheapest and weakest tanks are all heavies. Although I should say the Churchill is by no means "weak" at all.
The most scary part of UKF is the insanely powerful scaling; with every tank basically having blitz and smoke as a part of vet as well as other powerful abilities.
<blitz and smoke as a part of vet> you know something that i don't?