Countersunk - swap is the operative word. They are contracted to remove all the legacy stuff. No one seemed very interested when I asked about the HDDs or what happened to the legacy stuff. As far as I know they will be free to dispose of it as surplus with the money coming back to MOD, after expenses of course.
You can see why units will not provide new kit that is not from Atlas as Atlas will take it off your hands for free.
Any idea of keeping the old 19 inch monitors - forget it. Atlas will be contracted to remove X old monitors. If you retain some then you pay.
Swap the old 19 inch for the 17? Forget that too. Your old monitor will have a VGA socket the new ones have some special gucci connector.
Who signed off? Well the Scottish Gp Capt would seem to have had a hand in it or so I learnt here in pprune.