Ben Parkinson issues challenge to a Princess

The recovery of injured Afghanistan veteran Ben Parkinson has amazed doctors - he has taken on feats of endurance that would even be a challenge to able-bodied veterans. But Ben Parkinson, from Doncaster, has thrown down the gauntlet to the Princess Royal no less - to join him on his latest venture. He challeneged Princess Anne to a parachute jump when he met her at a royal garden party. Michael Billington was there..