I am extremely grateful to the hon. Lady for calling this debate. She is precisely correct that this is what most of the debate in the House will be about. She said a little earlier that we joined the customs union when, effectively, we joined the European Union, as was reaffirmed in the referendum of 1975. Is that correct? If so, that sets the basis for what the Government have to argue, namely that in the referendum that we held this year we voted to leave the European Union and the directive is therefore to leave the customs union; we have to argue back from there. Will she clarify that point?