I am happy to do so. If the right hon. Gentleman will allow me to finish this section of my speech, I will come on to the cost in a minute.
Britain is going to leave the European Union, but we are not leaving Europe, and we will not leave our European and NATO allies behind. Being recognised as one of the five nuclear weapons states under the nuclear non-proliferation treaty confers on us unique responsibilities, because many of the nations that signed the treaty in the 1960s did so on the understanding that they were protected by NATO’s nuclear umbrella, including the UK deterrent. Abandoning our deterrent would undermine not only our own future security, but that of our allies. That is not something that I am prepared to do.