At school, Simon Woodroffe’s exasperated chemistry teacher once declared “you’ll either be a millionaire or go to jail”. As it turned out, the founder of restaurant chain Yo! Sushi and one of the original investors on TV’s Dragons' Den did both. Now 74, the entrepreneur is still bubbling with ideas as he looks back on a life that took him from a privileged upbringing, attending elite Marlborough College , to leaving school with two O’levels, and becoming a music roadie. A rapid rise saw him