4. In article 3:
(a)for paragraph (1), there shall be substituted:
“(1) Subject to paragraph (4), an entry clearance shall only have effect as leave to enter if it complies with the requirements of this article.”; and
(b)after paragraph (3), there shall be inserted:
“(4) Subject to paragraph (5), an entry clearance shall not have effect as leave to enter if it is endorsed on a convention travel document.
(5) An entry clearance endorsed on a convention travel document before 27th February 2004 shall have effect as leave to enter.”.