I edited my post, not sure if you saw it, with the link to the best beer guide by Camra. Would be appropriate. My membership has just ran out otherwise I would given you the details to get a few quid off.
http://www.camra.org.uk/page.aspx?o=gbg
The nicest ale I've ever had is Dark Island Reserve Orcadian Ale.
Matured for 3 months in Malt Whisky casks (I think Scapa). Awesome, but it is about £12-18 for a 75cl bottle.
500ml bottles are a bit more reasonable in terms of price, thanks.You can get a 500ml bottle for £10, a few places have it online but I'd have no idea if they were reliable or not.