(ATV situation comedy, 1966-8)

Episode 3.4: The Holiday:
Originally aired in 1968 and found by Bob Wingrove, who provided this screen capture:

“The coaches are all from Valliant Cronshaw (you get a very brief look at an uncovered fleet name) and the vehicle on the right is actually AEC Reliance/Duple URO905E; again you see bits of the registration as she” (Peggy Mount, seen approaching) “moves in front of it. There are four coaches in the scene, all seemingly from the same batch.”