This statutory instrument establishes the annual revaluation of earnings factors for the purpose of calculating social security benefits in the United Kingdom for the 1990 fiscal year. The order is issued by the Secretary of State for Social Security under the authority of the Social Security Act 1975. It provides the legal framework for adjusting historical earnings to reflect changes in national average earnings, ensuring that pension entitlements and other benefits remain indexed to economic conditions.

This document serves as a primary source for legal researchers and pension administrators tracking historical benefit adjustments. Experts note that the text is highly technical and intended for use within the context of UK administrative law.