“The Respondent company contends, and the Court of Appeal has held, that the provisions regarding collection of tax by deduction from wages can never have been intended to apply to a foreign company, non-resident in the United Kingdom, which makes payments outside the United Kingdom. In my opinion this contention is erroneous, because it is based upon a mistaken application or understanding of the ‘territorial principle’. That principle, which is really a rule of construction of statutes expressed in general terms, and which as James L.J. said a ‘broad principle’, requires an inquiry to be made as to the persons with respect to whom Parliament is presumed, in the particular case, to be legislating. Who, it is to be asked, is within the legislative grasp, or intendment, of the statute under consideration? …”