Ah, more short term expediency no doubt.
Someone will have achieved (allegedly) a nice little promotion on the back of these cost savings. The developers (probably `Defence Consultants` in another life - again allegedly) will make a nice little profit when the MoD throws money back at restructuring the remaining locations later. In the meantime the perpetrators of these wonderful `save to spend` schemes will have moved onwards and upwards and will probably be commuting between Whitehall offices and country estates using HS2, 3 or 4.
Or perhaps I am just being a bit cynical?