In an extraordinary move, the all-party Treasury select committee is to appoint its own team of specialist advisers to gather what it says is the necessary level of detail about the work and costs, claiming previous exhaustive investigations by parliament and private consultants failed to produce sufficient evidence. The committee’s chairman, Andrew Tyrie, took Commons authorities by surprise by announcing that a Commons debate, which he says was due to be held this week on the restoration, had been postponed because MPs did not have the facts they needed. Commons sources said Tyrie was mistaken and no date for the debate had been fixed.