Oh, you mean that military unit within the London CTR which is permitted to reduce Class A separation standards to those which would cause a civil London CTR ATCO to lose his licence?
That's because we would not be able to operate otherwise
Don't even think about Northolt!!
Funny you say that HD, when the planning stages were going on Northolt were put forward as an option for providing part of the service. However the money that was being offered, coupled with the issues Brize Radar were experiencing knocked that one on the head.
MM