Grass
(BBC comedy series, 2003)
Opening episode of this rather flat spin-off (and that's a better joke than anything in the show) from the Fast Show has a couple of shots of Billy Bleach (Simon Day) travelling on an unidentified London MCW Metrobus. When transported to 'the wilds of Norfolk' he travels on a white/blue/grey Plaxton-bodied coach of Matthews (?) from a bus station full of First Group buses.