Dr Julian Lewis: If our EU friends were to demand a sum of, say, £1 trillion, rather than £100 billion, the position of the Opposition would have to be to accept that, because they would not walk away under any circumstances. Given that the Government would walk away under unacceptable circumstances of that sort, can the Prime Minister reassure us that all ​necessary preparations will be made so that we can walk away without a deal if we need to, which will, of course, maximise the prospect of getting a good deal and not having to walk away?

[The Prime Minister: Can I say to my right hon. Friend that, indeed, we are ensuring that the Government are preparing for all contingencies? That is a sensible, pragmatic approach for any Government to take. Of course, we are working for a deal, as I have set out in answer to earlier questions. Can I also thank my right hon. Friend for very graphically illustrating the position that has been taken by the Labour party, which is that it would simply pay any price for a deal, whatever?]