I will make some progress and then give way. I am mindful of the fact that 99 Back Benchers want to speak, and it is important, on such an issue, that I set out our position.
It is important to remember what the Bill does and does not do. It empowers the Prime Minister to trigger article 50—no more, no less. It is the start of the negotiating process, not the end. It does not give the Prime Minister a blank cheque—and here I want to make a wider point that has not been made clearly enough so far in any of our debates: no Prime Minister, under article 50 or any other provision, can change domestic law through international negotiations. That can only be done in this Parliament. If she seeks to change our immigration laws, she will have to do so in this Parliament in primary legislation. If she seeks to change our tax laws, she will have to do so in this Parliament in primary legislation. If she seeks to change our employment laws, our consumer protection laws or our environmental laws, she will have to do so in this Parliament in primary legislation. If she seeks to change our current arrangements in Northern Ireland, Scotland or Wales, she will have to do so in Parliament in primary legislation.