The place would be frequently Fog Bound and Highly Dangerous with the number of Sea Birds that happen to live there; the Bird-strike Risk would be a major concern.
With most aircraft having CAT 3 capability and much enhanced systems which be around in ten years time I don't think this would be a major issue - there are times when the current London airports become fogbound which slows down the flow rate - another reason for having more runway capacity in the SE.
Has any informed risk assessment been done on the bird hazard?