30 Squadron (Ventre A Terre) was based at Ratmalana, Ceylon (now Sri lanka)To protect coastal shipping . . FS. Lisle was flying Hurricane IIB aircraft BG 916 on a squadron exercise and entered the slipstream of another aircraft. His aircraft went into a dive at 800 feet and he was killed when he crashed into a lake near Moratura .
From rafcommands website:"Flew into slipstream, turned over and dived into lake from 800 feet, exploded in flames. aircraft crashed three feet of water. Engine and cockpit buried deep. Pilot body recovered and buried at Kanatta Colombo. Five aircraft had taken off to practice formation flying and all went well until Flight Sergeant J.B. Lisle in BG916 appreared to turn into the slipstream of another aircraft. This caused his Hurricane to turn over and enter a dive from which Lisle was unable to recover. His aircraft crashed into a lake, bursting info flames as it hit shallow water about 10 yards from the shore"".