Many people will be expected to leave the city by private car and the main road arteries will be cleared to help them. Others will be moved by commandeered trains, coaches and buses. If the Tube is not affected by the attack, it will also be used. Council staff will be posted to railway stations and other locations outside London to pick up passengers and give them accommodation. Mr Raynsford also published new guidance today on how to decontaminate buildings from chemical or biological damage. A highly-critical Panorama documentary called London Under Attack will this weekend allege serious flaws in current Government plans. The Tories have already seized on the Met study, commissioned from senior former Army and police experts by the Yard's anti- terror chief David Veness. The report, which has been suppressed by Whitehall, states that Government policy is "founded on the outdated premise of preventing public panic by saying as little as possible".