questionText: To ask the hon. Member for Blaenau Gwent and Rhymney, representing the Restoration and Renewal Client Board, with reference to the cost ranges set out in Table 1 of the costed proposals report, what assessment the Client Board has made of the historical accuracy of P50 and P80 estimates in comparable UK major projects; whether the inflation-adjusted cost ranges for Full Decant and EMI+ adequately reflect recent construction inflation volatility; whether the optimism bias applied sufficiently accounts for heritage, asbestos and live-estate risks; and what estimate it has made of the potential fiscal exposure to the taxpayer should cost escalation exceed the upper P80 range.
answerText: The recent report from the Restoration and Renewal (R&amp;R) Client Board, Delivering restoration and renewal of the Palace of Westminster: the costed proposals (HC Paper 1576), provides costs and schedules as ranges at different confidence levels (P50 an...
heading: Palace of Westminster: Repairs and Maintenance