DH and I are taking DD and friend to London for her 15th birthday next weekend but am lacking inspiration for something special to do. She has suggested Chinatown for dinner but want an event to go in the day as otherwise we’ll be wandering around markets which we can do anytime. Ruled out theatre as the shows she wants to see (Mamma Mia, Devil wears Prada, Abba) are sold out or astronomical. Please help with some ideas!