(1978, Richard Burton)

A London Transport RT is pursued by an RM which the camera follows through an arch outside 'Minster Abbey' - an integral part of the plot in establishing how the heavy road traffic contributes to the finale when the whole edifice crumbles (a model shot):

'Minster Abbey' is actually Bristol Cathedral - the two London buses were hired in for filming! In one shot a very distant (green!) Bristol Omnibus 'decker creeps into view, possibly a Bristol VRT/Eastern Coachworks. (thanks Scot Fergie)