A fancy prototype at the very end of the war -
The last legit Churchill was the Churchill VII with greater armor than previous versions and armed with the QF 75mm, used in the Battle of Normandy of 44'.
Granted there is also the neat Churchill IV AVRE and Churchill VII Crocodile. All depends if Relic chooses earlier war Brits with only a handful of questionable models of tanks, or later when they had designs that were working and effective against German armor.
152mm of frontal armor on the Churchill MKVII, wasn't sloped but there was so much it was effective at stopping shots.