Drygate Brewery is an interesting setup in this regard; brewing entirely independently yet it's a joint venture between C&C Group (Bulmer's etc) and craft brewer William's Bros. They using the logistics and infrastructure of the Tennant's Brewery (in whose grounds the brewery lies) but retain the hipster, indy feel. They're a nice bunch.
I suppose it's a way for the likes of C&C to insulate themselves against the craft-beer craze while retaining the credibility.
Probably old ground for the thread (tl;dr) but I do worry about this craft beer stuff. I fear that brewers (and Wetherspoons) promote it and cultivate such an air of Hipster credibility (by the sort of thing Drygate are doing) in order to wean us off the labour intensive and wasteful traditional British casks. We've come a long way in the last 20 to 25 years or so in resurrecting the British cask beer; it'd be sad to see all the beer in kegs again.