PermitToTravel
Established Member
presumably the first thing that should be investigated is the content of the mag stripe on the back. If, as the OP claims, it went through the barrier at Hitchin that day, that will be recorded on the magstripe and that should be the end of it!
Should it? You still have to date tickets even if putting them through the barriers. Theoretically, should the barriers not accept it anymore because the magstripe has it marked as used, one could still show it to staff to be let through.