We need a royal commission into the largest corruption scandal in this state’s history not only to expose how $15 billion has been rorted, but to ensure it never happens again.

Former ombudsman Deborah Glass and former IBAC chief Robert Redlich call for a Big Build royal commission in an interview with Nick McKenzie on 60 Minutes.

Premier Jacinta Allan blames inflation, not corruption, for the rising cost and says existing agencies have the matter in hand. But do they?