We had the good luck to see this outstanding and rare exhibition at The Wallace Collection https://www.wallacecollection.org/whats-on/exhibitions-displays/winston-churchill-the-painter/.
Churchill's scope was way beyond what we expected with differing styles and approaches, and he was VERY talented as a painter. Pablo Picasso reportedly said that if Winston Churchill were a painter by profession, he would have no trouble making a living.
If you will be in London with an hour to spare and interest in Churchill, do get tickets.