M609
I have never flown anywhere that speed control is used as it is at Heathrow and Gatwick. I can't think of anywhere else that it is used to maintain the bare minimum separation between aircraft. There can be no room for the confusion over whether the speed control exists after hearing "cleared ILS" that sometimes occurs as we bimble around the world. Checking with ATC is not an acceptable response either, since this thread is mainly concerned with R/T congestion!! Better to avoid the situation first, and I think that the current phraseology goes some way towards that.
moo
Aircraft step on each other and ATC all the time. I don't know if any statistics exist, but "not infrequently" is how I would characterise it.
G W-H