"Daft thing is, that little office is marked as "customers with fares to pay". When you get there its a fine." I've been luckier, presenting myself at that booth and been allowed to pay. But it was a while ago - maybe 2 years. Things may have changed. I was using an Oyster pay as you go at the time while waiting for an annual pass renewal through work. No ticket barrier at Peckham at the time and I simply didn't remember it wasn't a valid ticket until I tried getting through the barriers at LB. I've also made the mistake of travelling to Croydon twice on a Zone 1-2 annual pass, forgetting Croydon is further out. Both times I was allowed to pay the other end. Good luck, Fergie. I don't envy you your situation. If there were any way to pay a fine while avoiding an actual prosecution, I'd go for it.