Links

... to save argument, in alphabetical order within each group!

Model Bus Federation As far as I know, the only organisation devoted to the world of model PSVs.
   
Other Model Sites:
Crossways Ryan Birch's Gloucestershire-based fleet
London Country Group Alan Graves' model fleet
Padbus Paul Dudfield's Padbus Website
Redrover Buses The Red Rover model fleet
The Model Bus Zone Information on model buses from all manufacturers
   
General Bus Sites:
Johnsons Johnsons Coaches of Henley-in-Arden
Redwing Coaches Official pages of this central London firm
Scania Scania's Official Website in Sweden
Showbus All kinds of things - even buses for sale.
St. Petersburg Tram Collection Absolutely fascinating collection of 1:43 models
   
Major Groups:  
Arriva : FirstGroup : Go-Ahead : Stagecoach Group