The scrapping of the “lean-to” in favour of a full rebuild at Euston was one of the key demands of Sir David Higgins, the former Olympic Delivery Authority and Network Rail chief executive brought in to rescue the project this year. He gave a strong hint last week that he would walk away if the Government refused to back his vision. Asked by the Commons transport committee if he would stay beyond the end of next year, he said: “I want to see what progress we have made … and what support we have from any government.”