Pheasant Plucker,
A flaw in that argument.......
For example, Heathrow has, say 460 000 movements a year divided by 55 ATCOs.
But what about if we still had the Approach Radar here rather than TC? In that case it would be 460 000 divided by, what, 80? So by your formula we would quieter, when in fact each ATCO would be equally as busy.