As far as flown holidays are concerned, most British airports had cervices to Jersey and the Isle of Man, and quite a few had Ostend links too. The package-tour business really took off in the mid-1960s and initially most of it seemed to travel on non-UK airlines using DC6s.
My own local airport - Newcastle - had a fortnightly Euravia Constellation to Palma in 1964, two years later there were numerous weekly DC6s of TASSA, Aviaco and Adria. Gatwick at the time was 'DC6 City'.