Bottled off:Half of consumers cannot taste the difference between bottled and tap water, according to a survey by British consumer watchdog Which?

Nearly 20 per cent of the 3,039 people polled in the blind tasting preferred the flavour of tap water. Tap water, at an average price of 0.22 pence a litre, is 141 times cheaper than the best-selling mineral water, Evian, which costs 31p a litre in UK supermarkets, Which? said.