Hi there.
Does anybody out there know which UK airport G-AMPO would have been operating from, around the filming dates of 10th – 26th September 1979?

At that time, G-AMPO was operated by an early incarnation of Eastern Airways which operated 3 DC-3s from Kirmington/Humberside Airport (G-AMPO, G-AMRA and G-AMYJ). I am not familiar enough with the appearance of the buildings and airfield at the time to be be sure, but the terrain appears similar to Kirmington, although it could have been flown elsewhere for filming.

All three DC-3s were offered for sale in 1980 and Eastern Airways went on to operate a pair of Shorts 330 (G-NICE and G-EASI) before becoming part of Genair.