OK so City tower is done remotely from Swanwick.
But City Airport owners then decide it's still not cost effective and maybe a change of ANSP is called for.
Who owns the 'kit'? Can it be moved to another location? Where could it be done from if not City itself? If done from a room at City, does the room have windows in the walls? If you can see out of this room at City, why bother with all this expensive stuff, why not let the controllers look for themselves directly at the airfield?