pkirkham

If you're into Agile then Skillsmatter ( http://skillsmatter.com/ ) has a lot of free events

Or there's eXtreme Tuesday Club - http://xpday-london.editme.com/eXtremeTuesdayClub

Or if you want to meet a bunch of testers ( and me ) - London Tester Gathering - http://www.meetup.com/agiletesting/