Taxation (Cross-border Trade) Bill

The Minister has clarified that it is the Government’s intention to continue with the existing customs arrangements, and that the Bill will allow for the possibility of a continued customs union. Can he also confirm that the content of any new customs arrangements or customs union will be decided only through secondary legislation, rather than through primary legislation? Would it not be better to have a proper vote on the Floor of the House on primary legislation on whether we should stay in a customs union?