The £20 Penalty Fare I believe

Must have changed, I've been in the situation where I've boarded at
Ealing after a transfer from a FGWL, bleeped in on the platform on my
run to the train, but it didn't register.

Got charged about £3.xx when I got to white city.

As for the Olympia oyster readers, they aren't very clear as they
aren't by the gate entrance, they are on the platform about 1/3 and 2/3
down the car.

How do you touch in if there are RPIs on the platform entrance?