In message , Paul Corfield
writes

On Sat, 6 Feb 2010 09:01:24 +0000, Paul Terry
wrote:

Hence, an OEP is required. Touching in at Waterloo (in this example)
deducts a maximum cash fare, despite the fact there is a Z1/Z2
travelcard on the Oyster. The actual PAYG fare is then adjusted when
touching out (at Ricmond in Zone 4) - basically resulting in a charge
from the boundary of Zone 2 to Zone 4.

No - *if* an OEP is set before travel in this example then a "mixed
travel" entry charge being deducted. This is less than the maximum cash
fare - being £4.20 peak and £3.40 off peak.

How does that square with the statement in the TfL staff briefing
that...

"Passengers must remember to touch out when they have an Oyster
Extension Permit on their card. If they do not, they will be charged a
maximum Oyster fare." ?

And the statement on
http://www.tfl.gov.uk/tickets/oysteronline/5823.aspx about PAYG that ...

"When you touch in an entry charge of up to £6.50 will be deducted from
your Oyster card." ?

Does having an OEP reduce the entry charge to the figures you quote
above?

And why make a mixed-mode entry charge when in many cases the journey is
likely to be entirely on NR?

Sorry for pedantry but trying to get the terminology right is important
on such a complicated issue.

No problem - you are right to do so. But I get the feeling that there is
still a huge lack of clarity about the operation of OEPs.
--
Paul Terry