Had this some time ago with a passenger holding a return portion of a Saver (Off Peak) Return. If not clipped, perhaps use it again? Nope. I walked into coach, passenger looked right at me, then pretended to be asleep.
He even tried to turn it around saying he could have died of shock by me waking him up with the whistle and the passenger behind him shaking his seat, this he loudly stated about 30+ times was "Assault!!!!". I told him it was infact more likely to be a Vinegar.
£250 fine, £145 further costs, and for his abusive behaviour, 180 hours community punishment order. I didn't bother pass it to WorstGroup prosecutions as they really are stupid and useless - I let BT Police have that one