"I'll only be happy with Gold".
That's how one ex-forces Paralympian is viewing his chances in Rio. 
Former Airman Jon-Allan Butterworth won three silvers at the London Paralympics in 2012, so the seasoned GB cyclist says he won't settle for anything less than top spot this time around. 
Forces TV's Cath Brazier met-up with him at the Newport Velodrome in South Wales.