I did a bit of online searching to see what I could locate on Winston Churchill, artist. Churchill painted at his country home, 'Chartwell'. His wife Clementine said that he never even been in an art gallery before he took up painting. Although Churchill did study under an artist friend, Robert Lavery. In 1921 Churchill sold 3 landscapes under the pseudonym of Charles Morin, at a Parisian artshow. Check out this website for an interesting article on Churchill as an artist: http://www.winston-churchill-leadership.com/winston-churchill-painting.html. Churchill presented his painting Marakesh as a gift to President Harry Truman. This picture was later put up for public auction by Truman's estate. Sotheby's sold it for for 468,500 pound, or about $1,000,000 US.
For additonal information, see Robert Genn's Painter's Key: http://www.painterskeys.com/clickbacks/churchill.asp and reader's comments on the subject: http://www.painterskeys.com/clickbacks/churchill.asp
The Grombich website, from the UK lists in an article on this url: http://www.gombrich.co.uk/showdoc.php?id=15, the following items.