Can also recommend The Crown on Netflix, with American actor John Lithgow masterfully interpreting the Old British Bulldog. There's even an entire episode devoted to the affair of Sutherland's portrait commemorating Churchill's 80th birthday, considered one of the art world's great lost masterpieces:

Secret of Winston Churchill's unpopular Sutherland portrait revealed

http://www.telegraph.co.uk/news/winston-churchill/11730850/S...