http://www.legislation.gov.uk/nisr/1981/32/madeThe Contracting-out and Preservation (Further Provisions) Regulations (Northern Ireland) 1981Government Printer for Northern Ireland2016-12-22SOCIAL SECURITY The Contracting-out and Preservation (Further Provisions) Regulations (Northern Ireland) 1981RegulationsThe Occupational and Personal Pension Schemes (Contracting-out etc: Review of Determinations) Regulations (Northern Ireland) 1997Sch.reg. 1(1)