i bet you knew it wouldn't be long before i put my penneth worth's in, so here goes.
the churchill is my personal favourite the more i look into it the more i like it, a very much underated tank that has been labelled as unreliable and out dated yet it still performed all the way through the war and even at the end still gave the crews a better chance of survivability than any other british tank.
i was in touch with a chap recently that crewed a mk4 churchill through tunisia and never had a problem mechanically even after covering a 1000 miles (that's good going even by today's standards). i think the dieppe raid unfairly put the churchill in a bad light after the war, which is odd as the canadian crews swore by them and were totally sold on the tank.
eddy