Episode 4.02
A distant view of a United Automobile Bristol VRTSL open topper on Scarborough seafront:
Episode 4.07
"United Automobile 1600 (WHN600M), a Bristol LH/Eastern Coachworks, was in an episode in 1981 starring Paul Greenwood as a police officer based at Scarborough. The bus was then based at Pickering depot and the scene involved a smelly tramp boarding the bus and the driver (and conductor) promptly leaving the vehicle. It is doubtful that in reality Pickering depot (or even Scarborough) still had any conductors by this time." (thanks Tony Walshaw)
There's also a glimpse of a Plaxton bodied coach accompanying a film crew: