The Guardian has a feature today written by wine writer Peter Grogan on cheap supermarket wines. It includes some good tips though we'll have to agree to differ on The Whale Caller which didn't appeal to me at all.
Supermarket champagne and sparkling wine offers also seem to be in full flow. Tesco is offering half price deals off Mumm (down to £14.99), Lanson (£14.49) and Taittinger (£16.99) while Sainsbury's has reduced the price of the very decent Heidsieck Monopole Blue Top to a remarkable £11.99. Obviously you have to take the scale of the discount with a pinch of salt - the original selling prices are ridiculously inflated - but they're still useful reductions.