Mizter T wrote:

You're second paragraph hits the nail right on the head! Railcard
discounted Day Travelcard bought from LU ticket offices give you more
bang for you buck (or more mileage for your money) that if they were
bought from an NR ticket office.

NR ticket offices will sell you a railcard discounted ODTC valid in
zones 1-6 only - this is absolutely *not* valid anywhere in zones A-D.

It is, however, possible for an NR ticket office to issue a discounted
Amersham, Chesham, Watford, Croxley, Chalfont & Latimer, Chorleywood or
Rickmansworth to R1256 Travelcard, all of which have the same validity
as their LU equivalents.

This is an exception to the usual rule regarding the validity of "out
boundary" Travelcards, which normally cease to be valid (except on
participating local bus services) when you return to your origin station.

HTH,

Barry