Mad Jock
I agree in principle with your remarks, but having spoken to loads of my ex-Herc' mates who became civvie pilots,(and often flew into LHR ), about this problem there was one thing they were not aware of, and that was movement rates at airfields like LHR are decided not by ATC but by a Scheduling Committee.
This committee, if it still exists and no doubt Gonzo can tell us, consists of the operators, the owners of the airfield with a small input from ATC. They work out the movement rate and the poor old ATCO in the seat is the one who is under pressure to achieve the rate.
So, instead of 'telling' the ATCO to **** off, have a go at your own ops' department instead.