Bletchleyite
Veteran Member
When I first started travelling on the train (from Lichfield Trent Valley) there was a Pertis machine on the Birmingham-bound platform, and I would always put in the full fare to Birmingham when I had to use it. I think maybe there was a poster saying you should put in as close to the fare as you could manage?
There was, yes, but I very much doubt many people did.
(from my other post to clarify thread

The main reason for these was to prove where you came from, and the main reason for the charge was so the local chavs didn't hold the button down and dump the whole roll of tickets on the floor. Northern have achieved the latter with their analogous Promise to Pay tickets by making the process of obtaining them too involved for someone to do loads at once.