Although I had no link with either incident, I believe that the Air Ferry accident and the British Midland accident marked a shift in the post-war development of the independent airline sector in the UK. The press made much of the fact that these were both elderly "charter" airliners, the strong implication being that independent airlines ran old, unairworthy aircraft on unscheduled operations.
It was after these incidents that the independent airlines realized that the public were clamouring for jet aircraft, and when jets were introduced to package holiday flights, the brochures made much of "Direct Jet flights".
With two incidents occurring on consecutive days, both involving "old" piston engined types, the groundswell of opinion was very strong. Not long after these events, the independent airlines started ordering jet aircraft, and it wasn't too long before tour operators demanded jet aircraft.
Within 2-3 years, refuelling stops at Perpignan and elsewhere had ceased, and the piston engined fleets were replaced by modern One-Elevens, Comets and 737s. By the early 70s, piston aircraft were almost unheard-of on Inclusive Tour flights.