(1972, Jenny Agutter, Vivian Merchant)

Well-meaning low-budget TV movie about the Irish Troubles, which despite its opening shot is mostly filmed in and around Dublin, thereby undermining any attempt at authenticity.
That opening shot features Belfast Daimler Fleetlines:

…but crossing the end of the street in the distance here is a CIE Leyland Atlantean:

I'd welcome comment as to what bus was used for this interior footage:

A scene driving an army Land Rover around the city of Belfast is let down by a passing CIE Leyland Atlantean: