William Jemmett was suffering from a nervous disorder when he dived out of an upper storey window, during a stay in hospital. He had been administered a sedative drug that may have made him prone to delusions.
On 24th November, 1931, Flight Lieutenant Ernest Lacey and Pilot Officer John Edward Shrimpton were both killed when their De Havilland Gypsy Moth 60M (K1210) collided with one of 23 Squadron's Bristol Bulldogs (K1615), flown by Pilot Officer Frank Stokes, at 9.30am over Kenley Airfield.