Sometime in August (BBC drama, 1990)

Part of BBC2's long running 'Screen Two' strand (episode 6.07, in fact), this drama set in Edinburgh features three separate journeys by bus in the first quarter of an hour. The first is only seen as the interior of a Lothian Transport Leyland Atlantean:
The second concerns two schoolboys boarding Lothian Transport 942 (OSF942M), a 1974 Leyland Atlantean/Alexander. This bus differed from its sisters in being fitted with an SCG 5 speed gearbox instead of the standard 4 speed. Perhaps that's how it came to be used for filming:
The third features Lothian 722 (A722YFS), a 1983 Leyland Olympian/Eastern Coachworks: