Changes to Occupational Pension Schemes (Contracting-out) 1996
S.I. 1996/1172
Made by Public Service (Civil Servants and Others) Pensions (Consequential and Amendment) 2015
1 change. All changes to Occupational Pension Schemes (Contracting-out) 1996
From legislation.gov.uk's record of changes, the official one: see it there.