(Granada schools series, 1968-96)

One programme featured an 1890 Manchester Carriage and Tramways garden seat horse bus supplied by the Museum of Transport, Manchester (thanks Bob Wingrove).
Also appearing was ex Keighley-West Yorkshire K451 (JUB29), a 1932 Leyland Titan TD1 with Eastern Coachworks lowbridge body new to Glasgow Corporation but carrying Keighley-West Yorkshire livery (thanks Keith Jenkinson).

A programme about the evacuation of children in England in the Second World War features former Lancashire United 440 (MTJ84), a 1951 (oops) Guy Arab III with Roe coachwork. We don't see much of it, but a fictional fleetname has been applied to the side:

As the coach pulls away the footage fades to black and white:

There's also archive footage of a Plymouth double decker, fleet number 221: