Am in London at the weekend an MN Academy course, DH and DS2 will be visiting museums, etc while I'm busy studying. We're hoping to take in a show on Saturday evening but not into musicals, I'd love to see Twelfth Night but they're not keen, do we go and see The 39 steps, Mousetrap or something else? DS is 13, we've seen War Horse already. Are we likely to be able to get tickets on the day? Any recommendations please :)