Not quite the same vintage as 'Plado', my first visit to Luton was in April 1965. The old-old terminal (just off what is now taxiway echo) looked out over two grass runways (06/24 and 18/36) towards the main 08/26 runway. Constellations (Euravia, Brit Air, Skyways), Vikings and Ambassadors were being replaced with Britannias and HS748s. Jets followed in 1968.
Luton Flying Club operated three Austers, and was re-equipping with Cessna 150s. On my first visit in April 1965, I 'logged' about 30 aircraft.