So yeah, we have a great freelancer culture and small agency culture, it's about whether we want to also foster the start-up culture too.
It's definitely not as bro-centric as Silicon Valley seems. We have great events like Bar Camp, but it's much less "in your face" seeming.
Brighton is also a lot smaller than London - so we have all the right things, and moreso than most cities, but it's less foreboding and intimidating than places like London. I'm also not sure how many people would be happy with risking becoming like those places. Things are really tight, and people still have their passion for coding. I hate to think of that being pillaged by greedy capitalists.
Having said that, Cambridge is sort of it's own little world of specialist IT outfits but it just doesn't have the scale to become much more than it already is, or to develop synergies with other industries.
\ based roughly on my experience investigating the job market there a few years ago.
I've seen attempts to try and create a UK equivalent of "Silicon Valley". Where do they put it? London!!