# The National Insurance and Industrial Injuries (Turkey) Order 1961, Article 4


(1) Subject to the provisions of paragraphs (2), (3) and (4) of this Article, where a national of either Contracting Party is employed in the territory of one Party, the legislation of that Party shall apply to him, even if he is ordinarily resident in the territory of the other Party, and even if his employer or the principal place of business of the undertaking which employs him is in the latter territory.
(2) If a person, in the service of an employer whose principal place of business is in the territory of one Party, is sent in the course of his employment to work temporarily in the territory of the other Party, and is not a national of the latter Party nor ordinarily resident in its territory, then the legislation of the former Party shall apply to him as if he were employed in the territory of that Party, and the legislation of the latter Party shall not apply to him.
(3) If a national of the United Kingdom who is ordinarily resident in the territory of the United Kingdom is employed in the territory of Turkey, and the provisions of paragraph (2) of this Article do not apply to him, the legislation of Turkey concerning invalidity, old age and survivors' insurance shall not apply to him unless he so chooses and gives notice to that effect to the social insurance authority of Turkey. He shall also be entitled to choose that the legislation of the United Kingdom shall apply to him, and, if he so chooses, that legislation shall apply to him as if he were an insured person entitled to pay voluntary contributions from abroad.
(4) None of the provisions of this Article shall apply to any person to whom any of the provisions of Articles 5 and 6 of the present Convention apply.

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Source: https://www.legislation.gov.uk/uksi/1961/584/schedule/part/II/crossheading/article-4 (the official version)
Page: https://openlegislation.uk/national-insurance-and-industrial-injuries-turkey-order-1961/schedule/part-II/crossheading-article-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.