On Thu, 24 Feb 2011, Roy Badami wrote:

In article . li,
Tom Anderson wrote:

Not so! It is permitted, although it depends on the ticket.

I remain to be convinced. The Routeing Guide gives the routeing
permission as WA, and that map doesn't allow the WAML.

AFAIK, there are three FP - Cambridge fares

Avantix Traveller only shows fares for two routes (exluding staff
tickets): Route Any Permitted and Route Not London.

I don't have any physical evidence to hand, but next time i do this trip,
i'll keep the ticket, interrogate any TIs i meet, and post the details.

There is an easement that allows doubling back at Kings Cross, so you
can go from FPK to KGX to pick up the fast train,

Ah, i didn't know that. Can you double back by tube?

tom

--
If it ain't Alberta, it ain't beef.