Episode: Sleeper
Central to the episode is Jack Crump's Denham coaches VHV111G; this AEC Reliance/Plaxton Elite was new to Glenton Tours and has that operator's distinctive central entrance. It's seen on a fake tour of London:
Several buses are seen through its windows, the inevitable AEC Routemaster seen on route 12, a DMS Daimler fleetline, and a London Country Green Line Leyland-National: