If you like IPA (& I do) and strong beers, try Marstons' Old Empire. Bottled and available from Sainsburys. 5.7% and hopped to buggery.
If you've not tried it before, you really should try Guninness Foreign Extra Stout. In small bottles and 7.5%, so not for the faint hearted. Hoppy again, but what an aftertaste! Be wary of the Nigerian stuff my local Tescos are flogging. It's a very different beer.