I will just complete this section on the prerogative.
The underlying premise of the development of the prerogative is clear and obvious. The more significant the decision in question and the more serious the possible consequences, the greater the need for meaningful parliamentary scrutiny. That lies at the heart of this, and it is hard to think of a more significant set of decisions with very serious possible consequences than the terms on which we leave the EU.
I will press this point because all this is well known to the Secretary of State. After all, he tabled a ten-minute rule Bill in June 1999 that was concerned with
“the exercise of certain powers of Ministers of the Crown subject to control by the House of Commons”.
I shall quote his approach to the prerogative. When he introduced that Bill on 22 June 1999, the right hon. Gentleman, now of course the Secretary of State, said:
“Executive decisions by the Government should be subject to the scrutiny and approval of Parliament in many other areas... The Bill sets out to...make”
the prerogative
“subject to parliamentary approval, giving Parliament the right of approval over all Executive powers not conferred by statute—from the ratification of treaties to the approval of Orders in Council, and from the appointment of European Commissioners, some ambassadors, members of the Bank of England”.—[Official Report, 22 June 1999; Vol. 333, c. 931.]
So he has changed his position. Back then, he recognised that the prerogative ought to be subject to Parliament. It was 20 years ago, but progressive movement with the prerogative is usually in favour of greater accountability, not less, so the fact that he argued that 20 years ago is not an argument against doing it now. That Bill did not proceed, but the principles are clear and set out. The prerogative is not fixed; parliamentary practice and convention can change the prerogative, and have done so in a number of ways. In any event, I fall back on my primary point: even if the prerogative permits the Government to withhold the plans from Parliament, it does not require them to, and political accountability requires the Government to put their plans before Parliament.