800 quid? shite man, i could pick one up in canada for only 980$ canadian. I'd say if you're in the UK, screw new stock gibsons all together. If you have your heart set on it, buy it used. Otherwise, just get something cheaper, its amazing how little the quality varies between the 800-2000$ price range hahahahha.
personally, i'd go for a 70's walnut SG... they can be had for like 800$ US... not sure what that translates into quid though...