Nicks wrote:

Now resolved - SWT clerk must have done his homework and managed to sell me
a ticket only to Vauxhall, not London Stations yesterday.

Interesting. I sometimes travel out from Vauxhall, where I've always
been sold a ticket from "London Terminals", though I haven't yet made
any such journey this year.

If it's a return ticket then it's useful to have the facility to travel
back to Waterloo, either because the train doesn't stop at Vauxhall or
because that's where I'm heading. I shall see what I'm sold in the
future - perhaps it'll be from Vauxhall for shorter journeys/those in
the zones, and from "London Terminals" for longer journeys/those
outside the zones, as perhaps for such longer journeys there still
isn't a price differential between going from Vauxhall or Waterloo.
Perhaps someone with the current NFM might be so kind as to investigate?