Sadly, I have to agree with Mr. Grubby.
I had 3 minor 'shaftings'. Notwithstanding the unit requirements and mobile-grade thihg, there is and always has been a small number of people in management positions whose only source of job satisfaction is other people's unhappiness. They have never heard of the phrase '1 volunteer is worth 100 pressed men', so they never manage to get the best out of people.
I know of many good people who have left NATS because of this. From a recent course, a student from Hampshire was sent to Prestwick, while a student from Ayrshire was posted to LACC. They offered to swap, but HR wouldn't hear of it.
It creates unnecessary frustration, travelling, and is very expensive when the person leaves the company to work elsewhere.
I suspect this type of activity is not confined to ATC.