I knew a guy who worked for Shorts at Bovingdon, who provided handling facilities to the comms Squadron.
He was told when the RAF aircraft were selected by the manufacturer, they chose all the ones on the production line which had some sort of assembly problem and when they were delivered, they had to remove a certain amount of metal from the end of the props, otherwise on Bovingdon's 'hump' and under heavy braking, the prop tips touched the ground.
NB: I have no evidence to substantiate either of these tales!