http://www.legislation.gov.uk/nisro/1968/252/madeThe National Insurance and Industrial Injuries (Republic of Ireland) Order (Northern Ireland) 1968Government Printer for Northern Ireland2018-03-14NATIONAL INSURANCE AND INDUSTRIAL INJURIES The National Insurance and Industrial Injuries (Republic of Ireland) Order (Northern Ireland) 1968OrderThe Social Security (Ireland) Order (Northern Ireland) 2007art. 3(1)art. 1