It's definitely in the top three, and without a doubt the best English beer I've ever tasted. I'm talking about the J.W. Lees Harvest Ale 2006 aged in Sherry casks. I blogged about it when we first got it in (check a few posts down), but I hadn't tasted it yet at that point. It's extremely rare to find a beer with the complexity of this one.
This beer is not easy to get, so come by and snatch one for yourself while they're still here, because I can assure you I will drink them all in a matter of time.