I have the Imperial Airways and have just ordered the BOAC (1946-1974). I have also the BEA one (on loan from a friend) 1946-74. They last for 2 1/2 hours and are very interesting.
The Imperial Airways DVD is a disaster! They have taken the original films and chopped them and mixed them all up. Therefore it is very disjointed, the narration constantly changes, etc. Why did they not just keep the original films intact?