There are 10 out-of-London venues for the Olympics according to the official website, and Old Trafford, St. James' Park, and Hampden Park help to sell the idea of a 'British' Games. These are all being used for football though - hardly the iconic Olympic sport and so barely inspiring.
Everybody knows of 'The Boat Race', of course. Every year around the Easter period, a selection of very good rowers from Oxford and Cambridge slog their guts out on the Thames for about 20 minutes to batter their opponents into exhausted defeat. Less well known is the women's Boat Race.