Metronet: Atkins and Balfour Beatty keen to keep on

Reading statements from Metronet partners Atkins and Balfour Beatty recently suggesting that they take part in a new PPP contract surprised me somewhat. Especially the quote from the BB spokesperson that "we have all the staff, equipment and know-how there already." Is this the same know-how that led to £2bn of cost over runs and repeatedly missed deadlines for engineering work blighting Monday morning commutes?