In message
, at
09:57:19 on Wed, 28 Sep 2011, Francis Davey remarked:
I wondered if anyone can help me. I've just had a very unhelpful
discussion with a ticket vendor at Finsbury Park station, but i don't
entirely trust his response.

I'd like to travel from Finsbury Park to Shelford (Cambridgeshire).
There are two obvious routes: (1) train to Cambridge and then train to
Shelford; (2) Tube to Tottenham Hale and then train to Shelford.

I'll probably go via Cambridge, but coming back it looks like both
routes may be quickest depending on when I arrive at the station
(which is a random variable).

If you know you are going in a loop, then you can buy a ticket from FP
to Cambridge; use the outbound half to Cambridge, then immediately use
the return half towards Liverpool St, but break your journey at
Shelford.

--
Roland Perry