When I joined Caledonian Airways in April 1966 the fleet consisted of six Brits and a DC7C. Wonderful aircraft, the Brits. My first flight was on one ... LGW/CIA/LGW ... and made many transatlantic flights on them. Much much more comfortable and pleasant than flying economy today.
As for movies ... part of A Dandy in Aspic starring Laurence Harvey (1968) was filmed aboard a Caledonian Brit at LGW.