Last night shift I worked, we had 75 arrivals in a 3 hour period
Which part of this was confusing? You were all talking about arrivals rates - so was I. The above figures were ONLY for arrivals - with the departures included, they would be somewhat greater!
As for Gatwick, they operate under different rules, with special provisions / procedures to enable the movement rate, as do many other airports. We are not so lucky. I also doubt whether aircrews are anything like as inattentive / uncooperative / selective in which clearances to follow as they are here. (please note that I am NOT saying that all pilots are as above - a considerable number in this part of the world ARE, though).