Another place to "hang out and work on an idea" is http://techhub.com http://techhub.com @TechHub, a little like a KickLabs but without a fund. But Y-Com 'equiv

Another place to "hang out and work on an idea" is http://techhub.com http://techhub.com @TechHub, a little like a KickLabs but without a fund. But Y-Com 'equivalents' would be Seedcamp (takes 8-10% of a startup) or The Difference Engine programme which is moving to Cambridge (just outside London)