In message , Sam Holloway
writes
a) Aren't people big enough to find their own way round the network?

Not if your a visitor to London. Or don't use the tube that often.
Just because you know the network doesn't mean everyone else does.
Im asked questions so often about lines and how to get places when Im
travelling that Im thinking of buying a blue hat and blue shirt and
charging for the information.
--
CJG