In this Act, unless the context otherwise requires,—
Minister means the Minister of the Crown who, under the authority of any warrant or with the authority of the Prime Minister, is for the time being responsible for the administration of this Act
responsible department, in relation to any proceedings or to any document, means any department of State that, under an enactment or with the authority of the Prime Minister, is for the time being responsible for a function or matter to which the proceedings or the relevant provisions in the document relate
responsible Minister, in relation to any proceedings or to any document, means any Minister of the Crown who, under an enactment or under the authority of any warrant or with the authority of the Prime Minister, is for the time being responsible for a function or matter to which the proceedings or the relevant provisions in the document relate.