219.—Whenever it is made to appear to Her Majesty that the Government of a foreign country—

(a) has provided that unauthorised persons going on board British ships which are about to arrive or have arrived within its territorial jurisdiction shall be subject to provisions similar to those of the last preceding section which are applicable to persons going on board British ships at the end of their voyages; and

(b) is desirous that the provisions of the said section shall apply to unauthorised persons going on board ships of that foreign country within British territorial jurisdiction,

Her Majesty in Council may order that those provisions shall apply to the ships of that foreign country, and have effect as if the ships of that country arriving, about to arrive, or having arrived at the end of their voyage, were British ships.