Boogie Beebies (BBC children's series, 2004-7)

Episode: Double Decker
Kingston upon Hull 508 (LAT508V, a MCW Metrobus) was new in 1980, but by 2006 operating City Sightseeing tours of Windsor as Ensign Bus 328. In this jolly show we get to see presenter Pete Hillier on both decks:
There' also a passable cartoon Routemaster/roofbox RT cross: