(1) The regulator or an authorised person may -

(a) enter any premises with a warrant issued in accordance with article 41, together with any equipment or material as may be required;

(b) when entering premises by virtue of sub-paragraph (a) -

(i) be accompanied by an authorised person and, if considered appropriate, a constable;

(ii) direct that any part of the premises be left undisturbed for so long as may be necessary;

(c) require any person believed to be able to give information relevant to an examination or investigation -

(i) to attend at a place and time specified by the regulator or authorised 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);

(iii) to sign a declaration of truth of the answers given by that person;

(d) require the production of -