Well, when I say that the design office that co-operated with the TV producers was Handley Page, whose location is about 2 miles down the road from the relevant TV studios, and the shots are actually filmed at their factory .........

The aircraft is the "Scott Furlong S F 200 'Sovereign' ". There are inevitably elements of the Handley Page Jet Herald project in it. The story line later moved on from a passenger jet (which appears to predate the comparable Embraer 145 by about 30 years) to a military VTOL aircraft obviously based on the Harrier prototypes of the time, which the production team "flew". As you can imagine, the aviation press of the time took an interest in it all.

http://www.flightglobal.com/FlightPD...20-%200193.PDF

http://www.flightglobal.com/pdfarchi...0-%202616.html