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This is a response to a Freedom of Information request which asked about the HS2 spur to Heathrow and whether:
the £2.5 billion to £3.9 billion cost figures for the spur were relied upon by the Secretary of State for Transport of her HS2 decision on 10 January 2012 - if they weren’t relied on it asked for details of the figures that were used
£1.8 billion is the current estimate for the HS2 spur to Heathrow relied upon by the Department for Transport and, if so, the date when this superseded previous estimates