In another thread buried deep in uk.transport.london, someone says:

...

It is stated in the TfL Board agenda papers for 9/2/05 that the DfT have
decreed that TfL zonal fares will apply to all NR journeys within the
zonal area by 2007. Implementation will be on a TOC by TOC basis
between now and 2007. Pre-pay will be part of the roll out of this
policy.

...

So does this mean no more CDR ticket prices? No cheap returns during the
daytime at all??? (unless you have pre-pay on Oyster under the new scheme?)

What about National Rail season tickets? I pay about 50 quid less for a
monthly season ticket from Bexley (Z6) to London for a rail-only season
ticket rather than buy an inflated-price Travelcard which I don't need
(carnets fine for occasional tube use, and can't say I can remember the last
time I used a bus). Loss of NR season tickets would mean something
approaching a 50% increase in my monthly commuting cost!

Rich