Then you have a situation where each reserved carriage is like a Ryanair plane - you know there are enough seats but if you want to sit with your companions you have to fight your way through the scrum. I’m not sure that would be very popular. Back to the mk4s, I really don’t think people need mollycoddling to this extent. Preparing passengers for a change in the position of the carriage letter?! Patronising doesn’t even begin to cover it.