Redair was based on and used Redcoat Cargo Airlines Britannia freighters for filming. One "exotic" destination was filmed @ Cranfield (complete with pyrotechnics going off around the airport "under attack"). Impressive low passes were filmed there. External & ramp shots were filmed outside Redcoat's hangar at LTN. The Britannia fuselage (G-AOVS now on LTN's fire dump) was used for much of the static filming.
The majority of Redcoat's flying was between LTN & West Africa (although the commercial office was near LGW). They lost a Britannia which crashed due icing after take off from Boston (returning from the weekly MOD Belize flight). Only the Flight Engineer survived (with extensive injuries) after being thrown clear on impact.
After the airline's demise, I beleive a company of similar name was set up as a freight forwarder, using other Cargo airlines.