I am most grateful to my hon. Friend for that, because it is an important consideration. There are two things of real significance—certainly of real prominence—in the political declaration. First, the European Union has accepted that the final arrangement will involve an independent trade policy. One cannot have an independent trade policy and belong to a conventional customs union. Secondly, there will not be free movement; one cannot belong to the single market without subscribing to the four freedoms, so those set the outer boundaries of any deal that will be done.