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a survey several years ago, carried out by The Sun
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That well-known aeronautical journal of repute. I call BS - a plane landing at Heathrow doesn't take two miles to land, the 777 on Wednesday took 1000ft without colliding with anything first. If the worst happened it would be concentrated in an area a few hundred feet across. What they've probably done is taken the maximum speed of a passenger aircraft and modelled it landing somewhere with no buildings. This is substantially different to an aircraft at approach or landing speed.
As for the hospital thing, you always build in more capacity than you need, which helps cope with unexpected outages (say an MRSA outbreak or an unserviceable operating theatre) or of course a major incident. One of the problems with recent PFI deals is cutting back on this extra, which is one of the causes of the Norfolk and Norwich patients-treated-in-ambulances incident before Christmas.