Love the fleet databases. Do you intend on keeping historical info in the databases? May be worth having a status field, e.g. 'In Service', 'Withdrawn', 'Sold'. Maybe a traffic light (RAG) system to save column width. It could prove to be handy tracking demonstrators and such.

Another thought I had would be the ability to view a record individually by selecting it from the results list. The individual record could include what Daniel has already said about a photo of the bus from flickr, but also could include vehicle history? e.g. "Aug 13 - Transferred from Deptford to Washington", or "Sep 13 - Rebranded from Metrolink to Tyne Tees Xpress" (). I can't think of any other site that provides that facility from one single source?

Also, although not strictly buses, would you consider creating a similar database for the Tyne and Wear Metro? If it had all the features above, again, I believe this would be the only website to have all that information in a single source - after all, it's supposed to be an integral part of an integrated network.