http://www.legislation.gov.uk/id/nisr/2000/246

SCHEDULECONVENTION ON SOCIAL SECURITY BETWEEN THE GOVERNMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND AND THE GOVERNMENT OF THE REPUBLIC OF KOREA

Part IIPROVISIONS WHICH DETERMINE THE LEGISLATION APPLICABLE CONCERNING CONTRIBUTION LIABILITY

Article 4General Provisions

(4)

Where a person is employed in the territory of one Party and self-employed in the territory of the other Party for the same period, liability for contributions for him shall be determined only under the legislation of the Party in whose territory he ordinarily resides.