On Sat, 20 Oct 2007 00:03:46 +0100, Barry Salter wrote:

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.

Just to clarify, is an Amersham to R1256 Travelcard valid to Chesham?