Many years ago at a Guest Night at RAF Northolt I was chatting to a Retired Wg Cdr with DS0 & Bar, DFC & Bar who had been the Sqn Cdr of the Unit from which Guy Gibson had borrowed a Mosquito for his final mission. This Gentleman insisted that the crash of the Mosquito on its return flight to UK was because Gibson was not familiar with the fuel management system required in operating the Mosquito .
I see that Wikipedia state that after the crash the fuel tank selectors were found to be incorrectly set.