Just old stock, we had loads of them at our place until fairly recently.
My personal ones are British Railways ones
Old stock? It's just a piece of paper printed off. The company would definitely have "stock" out of service signs you could print in seconds - if people cared to look.
No it isn't, it has adhesive strips on it. It's a BR design that was rebranded by the Central Trains TOU without even bothering to alter the font in the 90s. It was a piece of ordered in stationery, hence the cat number. They got issued out in handfuls and they don't get used very often so it's not unusual to see old items still about. I was issued with a load of Central Trains branded items in 2013, they ran out shortly afterwards.
I have a similarly amended pink Central Trains TOU guards journal from the same era.
Nowadays they are just printed off sheets but the item in the picture was ordered in from the catalog and arrived in a cardboard bound book of however many that you pulled out.
Fair enough - looks pretty tacky though for something that is company issued though!