An As Eilean (1993, Ken Hutchinson, Iain MacLeod)

Two love stories filmed in Scottish Gaelic in Wester Ross (not to be confused with Westeros) in the North West Highlands of Scotland, and featuring Q224GFV, a unique vehicle in the fleet of Westerbus of Gairloch, with a mystery-shrouded history. Its construction is believed to have started around 1980 as a prototype by Systech Ltd, a sister company to Willowbrook. It was intended to design a rugged vehicle for export, possible for Singapore. The Willowbrook body was eventually completed by Imperial, a minibus conversion company in Liverpool, reportedly using automotive engineering students.
It is recorded as having a Ford R1114 chassis, but with elements of Bedford and Albion engineering and a Perkins engine. Being of mixed origin it was assigned a Q plate when finally registered in 1986, and spent its working life with Westerbus. [This is a summary of what I have gleaned from the Internet - I am open to correction]
The non-UK windows can clearly be seen in the two sequences where the bus is seen on school bus duties:

Less rare is Westerbus KPP616V, a DAF MB200/Plaxton Supreme IV, new in 1980 to Sabre Coaches (Smith of Bedfont):