We are a family of 4 (boys 10 & 9) and will be in London in June. We would love to experience afternoon tea. I was thinking a themed one might be more fun for the kids. I found Mad Hatter themed at Sanderson, Harry Potter themed at Cutter and Squidge, and Charlie and the Chocolate Factory themed at One Aldwych. The cost doesn't effect the choice. Also on my list is Wolseley but I am not sure we would want to go twice in our 6 days.
Any one have first hand experience with any of these (minus Wolseley I know that one is always mentioned)? The down side to the Harry Potter one that I see is they have tables of 2 so we wouldn't get to all sit together.