This document establishes the formal legal amendments to the existing tonnage measurement regulations for merchant shipping vessels. The regulations were drafted by the government of Great Britain to ensure compliance with international standards regarding ship measurement and safety protocols. It serves as a technical instrument for maritime authorities and shipping operators to calculate vessel capacity for taxation and regulatory purposes.

This text is a specialized legal instrument intended for maritime lawyers, shipping industry compliance officers, and government regulators. Experts view this as a foundational regulatory document for understanding the evolution of British maritime tonnage standards during the late twentieth century.