(2) Reasonable prior notice must be given before exercising the powers in this article.  (3) A person in control of the premises to which the Regulator or authorised person reasonably  requires access must allow the Regulator or authorised person to have such access.  (4) The Regulator or authorised person may, when inspecting premises—  (5) Except to the extent agreed by the person in control of a place or premises, the power  referred to in paragraph (1) does not apply to—  47. —(1) A Regulator or an authorised person may—  (2) The powers in paragraph (1) may only be exercised where the Regulator or an authorised  person reasonably believes that there has been a failure to comply with the requirements of this  Order.  (3) Except to the extent agreed by the person in control of a place or premises, the powers  referred to in paragraph (1) do not apply in relation to—  ( a ) 1911 c. 28.  25 (a) a prohibited place for the purposes of the Official Secrets Act 1911; or  (e) inspect and take copies of the records and entries referred to in sub-paragraph (d).  (iii) entries in a record referred to in this sub-paragraph;  (ii) other records which the Regulator or authorised person considers it necessary to see  for the purpose of an examination or investigation;  (i) records required to be kept under this Order;  (d) require the production of—  (iii) to sign a declaration of truth of the answers given by that person;  (ii) to answer questions, in the absence of any person other than those whom the  Regulator or authorised person allows to be present and a person nominated by the  person being asked questions;  (i) to attend at a place and time specified by the Regulator or authorised person;  (c) require any person believed to be able to give information relevant to an examination or  investigation—  (ii) direct that any part of the premises be left undisturbed for so long as may be  necessary;  (i) be accompanied by an authorised person and, if considered appropriate, a constable;  (b) when entering premises by virtue of sub-paragraph (a)—  (a) enter any premises with a warrant issued in accordance with article 48, together with any  equipment or material as may be required;  (b) any other premises to which the Crown restricts access on the ground of national security.  (a) a prohibited place for the purposes of the Official Secrets Act 1911( a ), or  Powers of entry, etc.  (f) request any person at the premises to provide facilities or assistance to the extent that is  within that person’s control.  (e) take samples of any articles or substances found in, or on, the premises and of the air,  water or land in, on, or in the vicinity of, those premises,  (d) take measurements, photographs, recordings or copies of anything,  (c) request the production of any record,  (b) install or maintain monitoring equipment or other apparatus,  (a) make any such examination and investigation as may be necessary, 