30 [360] (c) if the person appointed is an officer of the competent authority referred to in paragraph (1), on the person ceasing to be such an officer. (4) An authorised officer shall be furnished with a warrant of his or her appointment and shall, when exercising any power conferred on him or her under these Regulations, if requested by a person affected, produce the warrant of appointment or a copy of it to that person together with a form of personal identification. Powers of authorised officers 29. (1) Other than insofar as these Regulations relate to operators of essential services in a sector referred to in Regulation 7(2), an authorised officer shall, for the purposes of any or all of these Regulations and of ensuring compliance with their requirements or, where Regulation 24 applies, of assisting a competent authority in another member state in accordance with that Regulation, have power to do any or all of the following: (a) subject to subparagraph (d), at all reasonable times enter and examine any place owned or operated by— (i) an operator of essential services, (ii) a relevant digital service provider, (iii) a digital service provider referred to in Regulation 24, or (iv) a person on behalf of a person referred to in clause (i), (ii) or (iii), for the purpose of— (I) in relation to an operator of essential services or a relevant digital service provider, assessing the compliance by that operator or provider with its obligations under these Regulations and the effects of such compliance on the security of its network and information systems, or (II) in relation to a digital service provider referred to in clause (iii), assisting a competent authority in another member state under Regulation 24, and for those purposes to search and inspect the place, any process being carried out and any books, documents or records or things found at that place to the extent to which the place, process, books, documents or records or things relate to the network and information systems of that operator or provider; (b) at a place referred to in subparagraph (a), request, inspect, review and examine any books, documents or records in respect of the security of network and information systems of a person referred to in subparagraphs (a)(i) to (iii) which the authorised officer may reasonably