ASDA have a whole load of decent beers at 3 for £4. The usual ones like Pedigree, Master Brew, Hobgoblin, Goliath, Jennings Sneck Lifter, Directors etc.

They also have the following at £1 per 500ml bottle: -

Newcastle Brown

Old Peculiar

Deuchars

McEwans No.1 Champion Ale

None of these were marked up as £1 in the store but the website said they were that price. I've just been to the Bexleyheath one and queried the price and they were £1 so I bought loads.

Lidl have Pedigree,Spitfire, Bishops and Hobgoblin at £1.29 per 500ml bottle.