On Mon, 16 Nov 2009 18:53:14 -0000, Paul Scott wrote:

e.g Stratford (Zone 3) - Liverpool Street (Zone1)

PAYG Off Peak Single NR : £2.00
PAYG Off Peak Single TFL: £2.40

So it will be cheaper to travel on National Rail, a fact that would
surprise a lot of the average punters who, unless explicitly told,
will remain blissfully unaware !

Only if you assume that the long standing (ie well before PAYG on NR was
thought of) dual availability of LU fares on that route will definitely be
cancelled though...

The fact that LU fares are valid on NR between those stations doesn't
prevent NR fares also being valid...

Moreover, interavailability works both ways - so the cheaper NR fare
should be valid on LU between those stations.

Whether they will actually allow you to use that fare (and whether
they can legally prevent you from doing so) is another question...