13. In Article 12(1) (contract workers)—
(a)in paragraph (3A), for “Article 4A” substitute “Article 4A or 4B”;
(b)in paragraph (3B), for “Article 4A” substitute “Article 4A or 4B”;
(c)in paragraph (3C), for “Article 4A” substitute “Article 4A or 4B”.
Paragraphs (3A), (3B) and (3C) were inserted in Article 12 by regulation 4(3) of S.R. 1999 No. 311