So American Psycho the Musical is playing at the Almeida Theatre in Islington until Feb 3...tickets are sold out but they do day of tickets on sale at 11am (though you'd need to get there early for it) Info at:
http://www.almeida.co.uk/your-visit/booking-information/american-psycho-tickets/ I paid £26 for a seat in the circle...seats on the floor for the weekday show were £38...and if you have a student id it's only £16!
It's starring Matt Smith (aka the 11th Doctor)
and it's freaking fantastic! I got there at 8am yesterday to stand in line with a friend and we saw the evening show. The music is great and perfect (by Duncan Sheik) and Matt Smith is awesome and his accent is even good (to my ears at least!) and it wasn't terribly gory considering it's about a serial killer.
If you are able to see it I highly recommend it!