On a train to Sheffield. 50 year old middle class woman told me I'm in her seat. After comparing tickets and her being rather indignant about it all, I pointed out she's on the train 15 minutes earlier than she should be. She decides to just stay on and sits opposite, becomes slightly calmer. I suggest, if it was me, I'd go get on your correct train on the other platform as you'll need to buy a new ticket. She says no, it's only ten minutes difference, it won't matter. I insist it really will. She ignores me and stays on the train. I'm now really hoping the ticket inspector comes, but they seem short staffed, and annoyingly I think she's going to get away with it!