We watched the first one last night. As you say, some fantastic photography, but the sound-track/narration were pretty irritating at times.
And the Stow Maries airfield is a damned sight more than a 10-minute owl flight into central London! Neither is it disused - it is a pukka WW1 airfield that has been well restored. I believe that Auntie Helen's pater has landed a plane there. WARTIERs may well recall it on the route between South Woodham Ferrers and the Round Bush pub & café.