Originally Posted by
compton3bravo
For what it is worth I think the DC-3 could be the Handley Page hack G-ATBE which landed at Luton to clear customs or used Luton when Hatfield was closed.
G-ATBE was certainly common through 1967-1969, usually routing Radlett-Luton-Pau and back. It was first registered on 23/2/65 but wasn't actually registered to Handley Page until 3/6/67 (on which date it arrived from Gatwick, departing to Radlett on 9/6/67), which was a couple of years later than the photo.