I thank my right hon. Friend. It will be done through the parliamentary lock, which means that this House ultimately can decide what goes into UK law, consistent with the outcome of the referendum. Of course, if we decide to renege on the commitment or to divert from the common rulebook, that will have consequences for the relationship that we strike with the EU. That is why there are review mechanisms and other mechanisms for resolving disputes, as and when they arise. In any international treaty that will provide a sustainable, enduring basis for the deep ties that we have with the EU on trade and security, we need to make sure that we have sensible proposals and mechanisms for ironing out creases in the relationship as they arise.