Heathrow rate is currently 80 movements per hour, the SAME as the cap at Sydney. It would be near impossible to increase the rate above that as it takes up to 90 seconds for an aircraft to land and clear the runway and that will never get much quicker with the current generation of aircraft.
The reason why Heathrow has double the movements of Sydney is that 80 per hour is used in every hour of available ops whereas Sydney only use it in 3 maybe 4 hours a day.
Without doing the whole maths "mixed mode" increases the movements slightly as instead of 90 seconds bewteen arrivals, you make it 150 seconds and squeeze in a departure. Of course, by doing that you would most ceratinly increase the rate of "go arounds" too!
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