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Heathrow

My right hon. Friend the Secretary of State has already made the point that there has been a reversal of the ratio whereby for every two passengers going to London by air, one passenger travelled by train: it is now the other way round, and the trains are taking most passengers. When, on the odd occasion, I fly from Manchester to London, the plane spends as long circling Heathrow as it does on the journey. Surely, an extra runway would halve emissions from such aircraft.