All I can find so far is that he died on Operational Service, which is not operational related. The aircraft loss is not shown on the Lost Bombers website.
Looks like 104 Sqn lost four aircraft - L1341, L8868, L8873 and P6929.
104 Squadron were operating the Bristol Blenheim I from May '38-Apr '40 and was stationed at Bicester from Sep '39-Apr '40. They were, from 26 Sept '39 to Feb '40, a pool bomber squadron with No 6 Group (which looks like it may have been a training squadron).
BW7A