Coyne,
Just for info: Try keeping an eye on <a href="http://www.thisislondon.co.uk" target="_blank">http://www.thisislondon.co.uk</A> and <a href="http://www.a-london-guide.co.uk" target="_blank">http://www.a-london-guide.co.uk</A> to see what is scheduled in London. Also www.lastminute.com is a good source of unsold theatre tickets if he's interested in that.
PJ