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To ask Her Majesty's Government further to Full business case High Speed 2 Phase One, published on 15 April, what is the total amount of the ‘sunk costs’; what costs incurred before December 2019 were not included in the economic appraisal; what would the benefit-cost ratio figures be if those costs had been included; whether the writing off of development costs up to the time of Notice to Proceed is in compliance with the HM Treasury's Green Book; what other Government-funded projects have had the development costs written off; and whether any such costs were written off in order to improve the benefit-cost ratio figures.
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