maybe it's being up in the northeast, on trains that aren't standing room only past the first stop, but I generally see people respect the seat reservations. I've only seen a "that's my seat" discussion (not argument) maybe twice in the past three years.

My only complaint is people who think their ticket reserves a second seat for their jacket.

Oh, and the stag/hen dos in coming into Newcastle on Fridays, damn they can stink up a train.