Fruit drink company The Juice Doctor is gearing up for a national roll-out of its eponymous juice brand after successful trials across independent retailers.

The company, which has five times Olympic gold medallist Sir Steve Redgrave as a director, developed the drink to address what it said was the UK's growing ­problem of dehydration. Two out of three people in the UK suffer the effects of dehydration, it claims.

"There are millions of people who don't drink enough water, either because it's inconvenient or because it's boring," said Redgrave. "Dehydration is not just a sports issue - our bodies lose more than two litres of water a day from going about our daily lives. We've formulated The Juice Doctor to be a great-tasting and effective hydration fix."

The drink - in lemon, tropical and pomegranate flavours - has been on trial in 500ml bottles across 100 retailers in the south east of England. It is expected to gain listings in the major ­mul­tiples by the summer.