2(1)The powers of this paragraph are exercisable—
(a)by a person authorised by or on behalf of the Secretary of State, on production (if so required) of his authorisation ;
(b)for the purpose of securing compliance with any provision made by or under this Act, and of checking estimates and forecasts or verifying returns and information provided in response to directions under paragraph 1 above.
(2)The powers are—
(a)to require any person to produce for inspection, or to deliver up, any document in his possession or control which has been issued by or on the authority of the Secretary of State in connection with the administration and enforcement of this Act, or any provision made under it;
(b)to require any person with executive functions in an under taking, or the persons carrying it on, to produce documents relating to the undertaking or its operations, and allow copies or extracts to be made from them ;
(c)to require any such person, or one who has in the preceding 5 years exercised such functions, to provide further particulars as to the whereabouts, contents or subject matter of such documents.