Constitutional Reform and Governance Bill

The Secretary of State asked a moment ago, rhetorically, whether we really object to this measure. He noted that we have treated it with some humour, and indeed it is a humorous topic in many ways. However, why should we not hold the Government to their promise? He cannot get away from the fact that the promise that was made in 1999 was exactly that, and he is about to break it. What possible justification is there for doing that?