On Tue, 26 Sep 2006 12:19 +0100 (BST), Colin Rosenstiel wrote:

What about through fares to Underground zones? For example,
Cambridge to Morden?

Not sold as that AIUI. Cambridge to Zones 1 & 2 Saver Return:
29.00, with Network card: 19:15 66% of 29.00=19.14

Interesting. I thought that at least prior to the 2006 fares
revision, you didn't get the Railcard discount on the U12 part of the
fare. (The through fare would have been calculated as the sum of a
Cambridge to Finsbury Park Saver Return plus two Z12 Tube fares. Now,
it's done differently, though I'm not sure how.)

Even though most Cambridge-London services don't stop at Finsbury Park?

It could be King's Cross instead, but I assume Finsbury Park would be
valid (it's one ticket, not two, and the U12 part can be used between
FP and KX), and cheaper, so they'd have to issue that instead.