Fixed-term Parliaments Bill

I accept my noble and learned friend's rebuke. I come from a tradition which thinks that the Clerk of the House is normally the person best qualified to advise on these matters. The way that the Minister dealt with that did not show the kind of respect that ought to be given. I hear what he says. Perhaps I am a bit daft and am missing something here, but could he explain why it is necessary to have the certification process at all?