Our campaign, launched last week, aims to ensure that diners do not feel like "cheapskates" by having to ask for tap water without being offered it, as well as to help protect the environment. It has already won the support of dozens of London restaurants and leading chains as well as celebrity chefs including Tom Aikens, Jamie Oliver, Antony Worrall Thompson and Aldo Zilli. Britons drink three billion bottles of water every year, of which half a billion are flown or