I can understand the need to ensure people don't fare dodge, but in my opinion the best place to check tickets is actually on the trains, I realise when trains are overcrowded this isn't possible, but on train checks causes minimum inconvenience unlike barrier checks which create queues and the inevitably angry travelers who are going to miss their train. There have been extra onboard checks between Scarborough and York since before Xmas, much better than trying to check tickets at an exit barrier, and it has rounded up some characters who think that buying a ticket is optional.