Interviewed today on Radio 5 Live to promote her new book "Quite", Claudia Winkleman didn't know the question, but she said that bridge is definitely the answer. She first learned to play in her early twenties, and espoused the social and team communication aspects of the game describing it as "about as sexy a game as you can play". She also talked about how she has been playing online during lockdown and the possibilities of new players learning online.
You can listen to the interview via the Radio 5 Live website, on the Emma Barnett show. The bridge talk starts at about 11.40am, or 1 hour 36 minutes on playback.