Statutory surplus basis
From ACT Wiki
Pensions.
Historically, statutory liability valuation basis specified under the Income and Corporation Taxes Act 1988 for the purposes of determining whether a scheme’s assets exceeded 105% of past service liabilities and therefore whether a proposal to reduce the surplus was required. The prescribed basis was considerably more stringent than a typical valuation basis.
Was sometimes known as the ‘Government Actuary’s Basis’.
Under pensions legislation this requirement has been discontinued.