http://www.flickr.com/photos/katian/2896421860/in/set-72157607555357936/
Appearing on flickr as bug@hobgob, a bit of a google reveals them to be members of the Brockley Ukulele Group (B.U.G) performing at The Hob Goblin as part of the Newcross Festival.
Its definately worth visiting their website - http://brockleyukegroup.blogspot.com There’s some chord links to some great tunes - you sick little puppies 
Its no good. Im going to have to start up my own Ukulele Group - anyone want a H.U.G?
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Oct 4th, 2008 at 9:41 am
Good luck with the HUGging - the Brockley group’s only been going six months, most of us are beginners and we are now gigging quite regularly. We just started out at a local cafe, where one of us works and several of us drink coffee. A card on the noticeboard, a weekly rehearsal and away you go (Neil, Brockley Ukulele Group)
Oct 5th, 2008 at 11:27 pm
Thanks for getting in touch Neil - may the BUG continue to ‘rock the uke’ for many years to come
I put up some of my posters this weekend, and am now checking my emails (at least) every 5 minutes!