The Board of Actuarial Standards' guidance notes GN16 and GN28 have been withdrawn from 1st October 2011. GN16 has now been subsumed into the Board of Actuarial Standards new Transformations Technical Actuarial Standards. GN28 has been withdrawn and its content concerning the reference scheme test is now covered by The Occupational Pension Schemes (Contracting-out) Amendment Regulations 2011 which came into effect on 1st October 2011.