(04 Jun 2014, 8:43 pm)aureolin wrote I'm not defending a bus looking like that on the exterior, but perhaps it's more visible on a white bus than it is on the grey examples you posted? Another two you've taken of white buses:
Exterior shot of Go North East's 563, Transbus MPD/Transbus Mini Pointer by danielgrahamm, on Flickr
Exterior shot of A-LINE's T601JBA, Dennis Dart SLF/Marshall Capital by danielgrahamm, on Flickr
That M1 looks shockingly filthy :p
Same with the white van from the papershop!