3. In Article 1(1), for the definition of “determining authority” there shall be substituted the following definition–
““determining authority” means, in relation to Great Britain, the Secretary of State, an appeal tribunal, a Commissioner, an adjudication officer or a social security appeal tribunal, as the case may require, and in relation to Northern Ireland, the Department of Health and Social Services for Northern Ireland, an appeal tribunal, a Commissioner, an adjudication officer or a social security appeal tribunal, as the case may require;”.