12(1)If, on a person's examination by an immigration officer under paragraph 2 above, the immigration officer is satisfied that he has come to the United Kingdom for the purpose of joining a ship or aircraft as a member of the crew, then the immigration officer may limit the duration of any leave he gives that person to enter the United Kingdom by requiring him to leave the United Kingdom in a ship or aircraft specified or indicated by the notice giving leave.
(2)Where a person (not being patrial) arrives in the United Kingdom for the purpose of joining a ship or aircraft as a member of the crew and, having been given leave to enter as mentioned in sub-paragraph (1) above, remains beyond the time limited by that leave, or is reasonably suspected by an immigration officer of intending to do so, an immigration officer may—
(a)give the captain of that ship or aircraft directions requiring the captain to remove him from the United Kingdom in that ship or aircraft; or
(b)give the owners or agents of that ship or aircraft directions requiring them to remove him from the United Kingdom in any ship or aircraft specified or indicated in the directions, being a ship or aircraft of which they are 'the owners or agents ; or
(c)give those owners or agents directions requiring them to make arrangements for his removal from the United Kingdom in any ship or aircraft specified or indicated in the directions to a country or territory so specified, being either—
(i)a country of which he is a national or citizen ; or
(ii)a country or territory in which he has obtained a passport or other document of identity ; or
(iii)a country or territory in which he embarked for the United Kingdom ; or
(iv)a country or territory where he was engaged as a member of the crew of the ship or aircraft which he arrived in the United Kingdom to join ; or
(v)a country or territory to which there is reason to believe that he will be admitted.