He joined the Civil Aviation Authority as an airworthiness test pilot in January 1983, becoming Chief Test Pilot in 1995 before retiring in September 2003. During his CAA service Jock has flown most types of aircraft from the very small to the very largest and fastest. He admits to a great fondness for the Boeing 747 but it is Concorde which remains the focus of his affection. Jock converted to Concorde in 1989 and flew the aeroplane on a regular basis until his retirement in 2003. During that time, he was privileged to participate in all the flight test activities which arose, including in particular, the return to service tests after the Paris accident as well as participation in ceremonial flights such as the opening of the Scottish Parliament and the Queens Golden Jubilee.
Honours and awards include the Royal Aeronautical Society's British Gold Medal, 2002 and the Guild of Air Pilots and Navigators Derry and Richards Memorial Medal, 2003. He was appointed MBE in January 2004.