I have a long layover and arrive at Heathrow at 6:05pm on Nov. 17th. I don't leave until the next day but am wondering if I might have enough time to see a play? What are generally the latest start times for a Thursday night? Where would be the place to go to get tickets? I probably wouldn't be able to see anything before 8pm start time I'm guessing. Thoughts? Advice? Thanks!!