Freedom Fighter. In many ways he reminds of one of my favourite Prime Ministers; Ben Chifley.
Clement Atlee was not voted hte best British PM, Churchill was. What you are referring to is a group of 75 historians who narrowly voted him the best one. he was not the greatest British PM of the 20th Century. It was definitely Churchill.
You state twice in your post that Winston Churchill is the greatest British Prime Minister of the twentieth century, yet you do not specify as to why he deserves a title of grandeour proportions. With the exception of leading Britain during the Second World War it would be interesting as to why you have a profound liking towards Winnie.