In message , TKD
writes

And finally the people in London but on National Rail routes who claim
to be excluded.

They claim no such thing. They claim that Oyster is of no used for
occasional travel to London, since pre-pay is not accepted on most of
the national rail network.

What rubbish - are you telling me you never use the bus?
Get an Oyster card and you can start saving when you do.

In addition to a bus to the station, many people complete their journey
from the mainline terminus to the office by tube or bus. A one-day
travelcard covers all six stages of the return trip and is considerably
cheaper than using Oyster for the TfL bits plus a day-return for the
National Rail element.

As has been said here repeatedly, using Oyster is not a sensible option
for those who use National Rail and who don't have to commute daily.

--
Paul Terry