Before starting a new thread OCDP suggest you try the search facility which is just above the forum topic areas.
If you had bothered to put in “Thames Hub” you would have noticed many threads all covering the subject already including:
– A New Airport in the Thames Estuary
– The Moylan Report – A new Airport for London
– Boris Island
– London Heathrow 3rd Runway Ahead
– LHR Capacity
– Schipol is Heathrow’s 3rd Runway
– One Hub or None
– 4 Runways 4 Heathrow.
The pros and cons have already been well discussed in the above, if you have new information then consider using the threads already available. Do we really need another thread starting on what is probably the most discussed (posted about) subject on the forum already?