Had the privilege of working on one of that type of Buses when I was an apprentise
although they do remind me of On the Buses 
I still have every episode, including the B/W ones, and the three movies, brilliant.
A bit of useless info, the actress who played the mother, Doris Hare, (not Ceclily Courtlidge, who only played 'mam in the 1st series) went to school with my grandmother, St Gwladys School Bargoed.
'On the buses' was filmed using Eastern National's Wood Green depot.
The earlier series (with red-liveried buses) featured Bristol KSW5Gs with lowbridge ECW open-platform bodies.
Later episodes (green-liveried buses) featured late-model Bristol Lodekka FLF6LXs, whose usual domain was ENOC's flagship London-Southend service.
Splendid vehicles with semi-automatic transmissions.
Found this:-
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And this from Wiki :-
THE BUSESThe red "Town & District" buses were Bristol KSWs with Eastern Coachworks bodies. These were ex Eastern National. Stan and Jack's "regular" bus appeared to be VNO 857.
The Green "Luxton & District" buses were Bristol Lodekkas with bodywork by Eastern Coach Works of Lowestoft. In reality these were Eastern National buses (in some episodes buses could be seen with Eastern National on the side), although as mentioned earlier, some of those in the interior depot shots were in fact "dummy" buses. Some "dummy" buses were real single deck buses with a wooden frame on top, such as in the episode Series 3 Episode Radio Control, when the bus has crashed into the bridge. The most commonly used bus in the series was AVW 399F.
The open top bus in 'Holiday on the Buses was XFM 229, a Bristol LD new to Crosville Motor Services.
The bus at the safari park in 'Mutiny on the Buses' was NRN 607, a Leyland Atlantean/Metro Cammell, new to Ribble Motor Services.
