European Union (Withdrawal) (No. 5) Bill

I entirely agree with the noble and learned Lord that it is most important that there should be as much legal certainty as there can be, but also that the Prime Minister should have the proper role and authority to negotiate. However, does he agree that the royal prerogative exists to allow the Prime Minister to negotiate on our behalf in international and foreign relations unless Parliament actually restricts that authority? That of course was the subject of the Gina Miller case and the reason behind that decision. If we say nothing about the restrictions on the Prime Minister, she will be able to rely on the royal prerogative.