Barry Salter wrote

On Sun, 26 Mar 2006 10:17:21 +0100, Paul Corfield

wrote:

It used to be a much wider area than Greater London when I had a
close
involvement in all things ticketing. Cambridge always had return
tickets
valid for longer than one day. I imagine it has all changed and the
"rules" are now impenetrable.

In general, "period" returns are only available for journeys over 50
miles. Similarly, "day" returns are generally only available for
journeys *up to* 50 miles. There are, of course, exceptions to [...]

You are confused. The situation is in flux and no such simple rule
obtains.
Day returns and CDRs were available for all distances, and eg,
London/Bournemouth (90 miles) is still available.
The wish of GNER to disappear all discounted returns and replace them
by prebooked singles means that walk on day trips London/York,
London/Edinburgh and so forth require a Saver Return minimum.

For returns valid for longer than one day SWT's leaflet, apparently
already obsolete since their Saver Returns have been withdrawn, says
Network Awaybreak Returns are available "on selected journeys over 35
miles" and Saver Returns "on selected journeys over 50 miles" and Open
Returns "on selected longer distance routes".

--
Mike D