Confessions of a Driving Instructor
(1976, Robin Asquith, Anthony Booth)
A truly terrible film, filmed in Borehamwood, Hertfordshire; the opening has a couple of unidentifiable coaches, the second at least being Duple-bodied:
As Timothy Lea (Asquith) and his business partner move into their new office, a London Transport DMS-class Daimler Fleetline passes:
Another is seen during a driving lesson with Miss Slenderparts (Irene Handl), and another as Lea and Mary (Linda Bellingham) drive away from a disastrous party:
At the rugby ground two coaches are glimpsed, one red/white, the other a white Plaxton Elite with a red diamond on the back. There is also a rear entrance Bristol Lodekka - but this has mysteriously disappeared by half-time:
The closing car chase has another DMS, also a pale blue Leyland school bus: