London's a great place to see your favorite actor in a play. HOWEVER, get your tickets in London. I bought my ticket online thinking it would be hard to get a ticket, and when I went to the box office they had trouble finding my reservation and I was lucky to have my printout confirmation with me. So I got to see Matt Damon. But I could've seen him anyway if I had gotten a ticket that day--planning ahead doesn't help. Also, for free you can see the stars on the street between shows and not have to see the uninteresting shows that they're in.