The Tuttle Club is a great place to meet (on a Friday, in Central London, details of where and when). I went there for the first time last week, having invited several people I knew to be there so I could make some introductions. It is a friendly and interesting place to meet up with contacts old and new.
The Tuttle Club is run by Lloyd Davis who I first met at the Temporary_School_of_Thought during a one week programme of events (I had gone to a presentation by Vinay Gupta). Lloyd has written more about that week here. The Temporary School of Thought is now temporarily closed but hopes to re-open in a new location.