Agree.
All the aircraft shown are from RAF 2 Group, UK based, and the "arid desert" was the English Channel and the coastline of France and / or Holland.
The footage of the Mitchells was more likely filmed in late 1943 to early 1944. The last section, with the Mosquito's, shows Percy 'Pic' Pickard putting on his 'Mae West', over the Paratrooper's Denison smock he regularly wore, and might have been shot at the time of the Amiens prison attack, February 1944, the raid he was lost on.