27 year old Deverill had once been a "Halton Brat" - that is to say, a pupil of No 1 School of Technical Training at RAF Halton, where apprentices and boys were trained to become technical staff to service and repair aircraft. Deverill had outstanding natural ability, and overcoming all the usual conventions he had remustered as a pilot in 1938. He had flown over a hundred sorties, most of them for Coastal Command, before he once again bucked the norm and became an officer, having worked his way up from the very bottom of the ladder. There is no doubt that he was a superb pilot. For his bravery and persistence he had won the Distinguished Flying Medal, and the Distinguished Flying Cross twice. He was posthumously to be awarded the Air Force Cross.
Deverill had been one of the stars of the early days of 97 Squadron at Woodhall Spa. He was on the famous Augsburg raid of 17th April 1942, when 97 Squadron had garnered a sheaf of honours. A daring and in the event very costly experiment by Harris using the then new Lancasters, the raid had been a daylight operation to Bavaria to wreck the engine assembly shop within the MAN diesel engine factories. The operation was dogged by ill-luck and, though serious damage was done to the factory, only five of the twelve Lancasters reached home. The raid proved once and for all that even the magnificent new Lancasters could not be used in daylight raids. Deverill got his plane back to England only after it had suffered appalling damage. Y-Yorker had been hit in numerous places; it had lost an engine, the hydraulic pipes had been ruptured, the gun turrets put out of action, and at one stage the hydraulic oil caught fire, burning a large part of the fuselage. Y-Yorker was a write-off for any future operations, though it was patched up and used for training at Wigsley until the following year, when it was lost in
a training accident over Hertfordshire.