4.—(1) No authorised officer may enter business premises in the exercise of the powers under paragraph 3 unless the officer has given the occupier of the premises a written notice which—
(a)gives at least two working days’ notice of the intended entry;
(b)indicates the subject matter and the purpose of the intended entry; and
(c)indicates the nature of the offences created by paragraph 15.
(2) The power of entry conferred by paragraph 3 is to be exercised by the authorised officer on the production of their authorisation.
(3) The power of entry conferred by paragraph 3 may be exercised only at a reasonable hour.