This Practice Note considers the key cases in the rectification of pension scheme documents, including Lansing Linde v Alber, AMP v Barker, Gallaher v Gallaher, Scania v Wager, Smithson v Hamilton re Siemens, Chartbrook v Persimmon Homes, FSHC Group Holdings v Glas Trust Corporation, Univar v Smith, SPS Technologies v Moitt, and Re Mitchells & Butlers Pension Plan.