Hi Ben;
I was appalled to read about your situation. I would guess (like the others) it's some sort of willful misreading of the H&S at work act and its possible implications.
I was with the HF unit in Bournemouth and I would be surprised if they had anything to do with it.
I would probably go as high with the issue as possible - this is probably just something that someone's got on their mind at the moment and they might be open to some pressure from elsewhere in the company.
If NATS is going to go that way, I still have permanent scars on my knees from the old horizontal radar displays at LATCC and must have slammed my forehead into the top of the door frames at Bournemouth at least 3 times (I can't remember any others) and I'm only 6'5"! Are they going to ban people over 6'4" from working down at the College?