Originally Posted by SomersetCyder

Hmmm not sure about this, certainly in my neck of the woods GWR get really quite stroppy about people joining trains late or getting off before their ticketed stop. Round here that's because on the evening trains out of Paddington it is often a lot cheaper to buy a ticket to somewhere in Devon and Cornwall and get off before Exeter. They don't like that! But then maybe they should sort the crazy ticketing system out and people wouldn't try it.