Simon Glancey has submitted the following:
Sgt Maddison was killed when Bristol Blenheim IV L9267 RT-K of 114 Squadron was lost on a patrol from R.A.F. Leuchars.
Royal Air Force Coastal Command Losses of the Second World War: Vol.1: Aircraft and Crew Losses 1939-1941; Ross McNeill; 2003; Midland Publishing; ISBN 1 85780 128 8, page 124