"Graham J" wrote in message ...

I defer to those who know what they are talking about but I think there were
at least some basic rules. For example 1-99 were routes that orginated in
central London, 2xx were once single deckers

I'm not so sure about that. I don't think the 83 has ever gone
anywhere near Central London, and the 207 wasn't a single decker -
it was the old 607 trolley.



Bob