The Wealth of Nations by Part 4 Chapter 6 Page 5

as was accustomed, till they were prohibited by the law; nevertheless upon this condition:

Art. II.

That is to say, that her sacred royal majesty of Great Britain shall, in her own name, and that of her successors, be obliged, for ever hereafter, to admit the wines of the growth of Portugal into Britain; so that at no time, whether there shall be peace or war between the kingdoms of Britain and France, anything more shall be demanded for these wines by the name of custom or duty, or by whatsoever other title, directly or indirectly, whether they shall be imported into Great Britain in or hogsheads, or other casks, than what shall be demanded for the like quantity or measure of French wine, deducting or abating a third part of the custom or duty.