ValleyLines142
Established Member
I'm a bit surprised that it took so long for people to figure out what happened.
Basically, you made the mistake of checking your balance DURING a journey.
NEVER do this (unless you are morbidly fascinated with the programming behind Oyster)!
If you had touched in at (e.g.) Knightsbridge, then handed your Oyster to a mate to check at the ticket machine outside the gated area, it could and would have shown a balance of -£7 or so as well.
Ah, I see. Thanks for that!