Hmmm. That implies an average of 260 pax per movement or, assuming a PLF of 75%, an average aircraft size of around 350 seats
Either a R3 or the NHT option would remove the small planes from the 2 main LHR runways; assuming the full Toast Rack went ahead with larger aircraft, what is your assessment of what is feasable in the mid to long term?
The A380 has suffered birthing problems and it's introduction slower than anticipated; some time ago BAA suggested A380's would make up 10% of atms within 10 years and 20/25% in the longer term.
Remember because of wake separation distances you can fly 2+ A380's in the space at present taken up by a single small aircraft; assuming the terminal capacity is there !