Jacko was a flying instructor for the RAF in Canada during the second world war. In 1944 he returned to England and spent time in Bomber Command flying Mosquitos before becoming a test pilot for the Andover XS790 - - Britain's first jets.
Jacko then went on to fly the new XK699 Comet> as part of the 216 Squadron on the Queen's Flight (transporting the Royal Family). Between 1956-1958 was based at RAF Lyneham, when he was awarded the LVO.
The cockpit of Jacko's Comet aeroplane is on display at Old Sarum Airfield.
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