This is nonsense up with which I cannot put. ATC's job is to separate traffic, NOT monitor my job which is to fly the plane. Are they down there BECAUSE I'm up here or is it the other way 'round? If I'm 2 knots fast, it's for a reason, now make an adjustment.
The tolerance I was taught, and work to, is +/- 10 Knots. I could see you getting upset about someone bitching about +/-2 Knots.
However, if you have been asked to fly a speed and are still 20 or 30 knots adrift after a reasonable time to comply, you will have to put up with my nonsense. My job of separating aircraft depends on the pilot doing his job of flying the plane as he is instructed to. If he can't or won't, my monitoring that non compliance and recognition that the actions of that pilot will erode separation will cause me to take action.
I'm down here because the people down the back are paying your wages and mine
