How Many Then?

There is sometimes talk about how CAMRA excludes keg producing breweries from its festivals. You may have noticed this and it is of course untrue. CAMRA excludes keg beers from its festivals. Those that produce both are welcome to put their cask offerings forward.

The Good Beer Guide 2013 (GBG) indicates that there are 1008 (have I got that right?) breweries operating in the UK. Almost all produce cask beer. It must therefore be a tiny percentage that are thus excluded.

 Does anyone know how many keg only breweries we have in the UK?

Why am I asking? Because I just don't know and wondered.