"Henry" wrote in :

Is there a logic to the numbering of bus routes in the London area,
such a 1-100 means one thing, 101-200 means something else, or are
they random, maybe loosely based upon a logical system of long ago
that has fallen into disuse?

In recent history there are many examples of the first digit being used to
distinguish similar routes, usually if one big route is split into a number
of overlapping parts
eg 68 - 68 , 168 , 468
12 - 12 , 312

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Andrew Black
andrewblack at despammed.com
London