On Jun 13, 3:02 pm, Tom Anderson wrote:
But presumably, that does mean that out in the suburbs, where the
lines/branches go their separate ways, the frequency really is down to 6-8
tph. There are places where that's the case in London [...] too, although it's
rare

On the SSL, the service on the Watford, Richmond, Ealing Broadway
(District), and Hammermisth (H&C) branches is 7tph.

The tube lines I'm not sure about, but you don't have to go that far
out to find 10 tph frequencies, especially in the middle of the day.

U