the fixie scene in london is pretty tight knit from what ive heard, but up here in the north, its nice. i has intimidated by couriers before i worked with them, now i know that just about anyone could go chat to them. they are really some of the most friendlyist people i know.
on the poseur issue, hardly anyone rides fixed exept couriers here. there are a few others, and of course, some people are dicks. but these people would be dicks whatever the rode, or did.