Simon Glancey has submitted the following:
Flight Sgt Cowan was the Wireless Operator aboard Short Stirling IV LJ843 of 196 Squadron, which crashed after being hit by flak on a re-supply mission in support of Operation Market Garden. The Stirling crashed at 15.15 at Renkum, with the loss of the eight crew.
Though without Anger: Losses of Transport and Special Duties Aircraft and Assault Gliders 1940 to 1945, C. Cummings, 2009, Nimbus Publishing, ISBN 978-0952661962, page 412
Also killed in the same incident was F/Sgt. Leonard Marsh
He is remembered in Ashington on A17.43 and at Hirst on H62.02