South West Trains really are keen to stop fare dodgers.
You get on the train. Within minutes, there will be an announcement that says “you must buy a ticket before you get on one of our trains, if you do not show a valid ticket when you are asked, you must pay a penalty fare”. The scrolling announcement in the ceiling is synchronised to say the same thing at the same time.
Then, there will be an announcement that “there is about to be a full ticket check, please have your tickets ready”.
Just to make sure you’re fully indoctrinated, this happens after every stop, and if you are travelling up and down to London on a daily basis, you’ll hear it probably 12 times a day.
… and, ironically, as I type this, the guard just came to check my ticket.