Apologies if this has already been posted in another thread (I had a look but couldn't find it), but people in and around London may be interested in this promotion:

http://www.youngs.co.uk/offers/south-africa-comp.php

We had a mini-ramble around Hammersmith last night, calling in at the Brook Green Hotel, Thatched House and the Ram, and the combined total cost of ?? pints of Ordinary was £0.

Not all Youngs pubs are participating, but there is plenty of scope for a cheap night out in other parts of the capital.