Many of them. Starlight Express, Phantom of the Opera, Les Miserables (At the Barbican, Palace, and Queens-not that I'm DATING myself by admitting it), We Will Rock You, The King & I (with Elaine Paige, and Jason Scott Lee), My Fair Lady (with Martine McCutcheon...
I went to see Blood Brothers - it was a fantastic show and more so the environment of the West End at night
Before that I had seen Phantom of the Opera (which I seem to have seen in most major cities now as am obsessed by it)
Met the cast of Miss Saigon at a private party. One of the people in our group was a filipina, from the same island as the lead actress. Was a very enjoyable evening. (Beat the bomb scare earlier at dinner that caused the restaurant to be evacuated)