And as for a non scrolling sign for "Unreserved" - I doubt it is possible, otherwise I am sure they would have tried it!
Not meaning to be offensive here, so apologies in advance

It's very possible, just depends on the person who programmed the computer, and whether they know what they are doing...
When I travelled on a Pendolino (for my sins

) they boards said when I arrived at a seat, Unreserved or Reserved. So it is possible

You would be suprised at the amount of people that work in IT, yet don't have a clue...
