That's always the problem with over-contractorisation and reliance on increasingly large numbers of civilian staff - they can't just be given a posting notice to somewhere hundreds of miles away and be expected to get on with it.
Above a certain grade, they are expected to do just that. Witness the relocation to AbbeyWood, which cost most a fortune and inflicted debts that took years to clear. The only difference between the Civil Service and the Services is, if you don't turn up at your new post you are deemed to have resigned, not gone AWOL.
The problem is that a sudden raft of resignations or early retirements doesn't bother the beancounters at all, who don't care a jot about maintaining Operational Capability.