Neil Williams wrote:

...and would open any barrier in London zones 1-3, but if an inspector
came around to check then a PF would be due if the appropriate Oyster
was not being carried (not touched in). Thus there would be no need
to touch in at all, and the problem would go away.

How would you solve the other problem of people with season ticket
travelcards starting journeys outside London? e.g. if I go to stay the night
in Surrey, I cannot get an overnight return extension - I have to buy the
ticket on the day. So I'll get one to the first station inside the zones but
do I then have to jump off at that station, touch on a pad and then waste
time at a remote outpost waiting for the next train?