A bunch of XP enthusiasts who meet in a pub in LondonTown on Tuesday nights
(in no particular order) :
There's a rather larger bunch of irregulars who turn up every now and again.
Such as...
Moved from XpDeveloper
XP Developer is an community of extreme programmers in London. Meet weekly at ExtremeTuesdayClub
More info can be found at http://www.xpdeveloper.net/