There is a slightly less ethical way to do this, you buy a ticket that mows you to travel at any time of day. Then when you have made your trip log on to realtimetrains to find a train on your route that was delayed and then claim that as your journey. Now your ticket is sometimes scanned when you enter or leave a station but this is rare and even less likely to be scanned on the train by a conductor. Anyway that is…
Do not mess with the railways and their revenue in England.