Ben & Jerry's become Green Dragons

Toby Talbot/AP/Press Association Images

Do you have a brilliant idea for an ethical business? Are you just waiting for the cash to get you going? Then this could be your big opportunity, because Ben & Jerry's is launching a new competition to find socially responsible start-ups, and the winner could scoop a €10,000 cash prize.

So what do you have to do to be in with a chance of winning?