Neil Williams wrote:

Of course there would still be the tricky issue of which route the
Oyster system presumed you had taken, regardless of what actual route
you did in fact take.

Richmond-Stratford, anyone?

As I live just down the road from Stratford and do some research in Kew I
could give it a go if I didn't have my season already - anyone care to buy
me a ticket that doesn't cover zone 1?