Balfour Beatty denied claims that its withdrawal was linked to the MCG's new focus on health and safety. The spokesperson said: "Our health and safety record is comparable with other firms and has improved over the past five years. We support the MCG's safety initiatives." He noted that the firm handed in its notice before the Hatfield rail crash.
MCG director Bill Tallis said Balfour Beatty's departure was not the start of a mass exodus of members.
He said: "I would be worried if other major players decide to leave but they have given no indication that they want to."