Not the answer I wanted to hear (but thanks for the quick reply )
I've booked my mum and myself from London to Edinburgh on 14:May:12 dep EUS at 23:50 arr EDB at 07:50 but when I got back home I noticed the reservations were for Carstairs not Edinburgh (they were behind my mum's ticket which is to Edinburgh). I was hoping that we were in the Edinburgh portion so that we could just stay on.
Still plenty time to sort it out. Just a thought there might be engineering works on that night?