Mark Lyons' Images
A few other sites that may be of interest.
A history of the Go-Ahead Group
I have recently written a history of the Go-Ahead Group which details the development of the Group and its antecedents from its roots in the north-east of England to today's FTSE quoted company
Bus Photography for the Digital Age
Written specifically for the road transport photographer, this is the first book dedicated solely to this area of interest and provides a useful reference source for experienced photographers and for those new to digital photography.
Mark's fotopic site
Views of buses in the UK
More than buses
Underwater and wildlife views from around the world
Great photo magazine