northwichcat
Veteran Member
Actually there is - the airline industry.
I actually saw this happen once - someone wanted to get off a plane a stop early and was told they'd have to either stay on to the destination on their ticket or buy a new one.
More commonly of course it's cancelling itineraries if someone no-shows for any part of it (e..g not letting people use the return half of a ticket if they aren't on the outward flight).
There are also some airlines that offer single fares that are more than return fares and, as a condition of carriage, state that you're required to make the return journey.
If someone does ask to buy a ticket from a barriered station and can't show how they got in legitimately then I do enforce the NRCoT and only sell an Anytime Single.
I understand you're allowed to do that for anyone who doesn't have a good excuse for not buying before boarding. Even if there was a fire alarm and the ticket barriers were left open for a short while after the station reopens, it doesn't automatically excuse someone for not using the ticket buying facilities.