"Recliner" gurgled happily, sounding much
like they were saying:

I have noticed on tube stations a map called "High Frequency Services"
which shows the tube AND National Rail services. At last visitors to
London will be able to see that there are train services in South
London!

I asked for a map like this about 5 years ago. I hope:
- that it will be given away, not just put on walls - that the
criterion for high frequency is trains at no more than 10 minute
intervals between 07.30 and 19.30.

Would all branches of the Undergorund pass that test? For example, I
doubt that Amersham and Chesham services achieve that frequency.

They won't. Some stations on those lines don't even get 10min frequency
in the morning/evening peaks.