dwelling without giving notice as required, the justice may issue a warrant authorising the officer to enter the premises at any time (by force if necessary). An authorised officer exercising a power of entry under this section must, if so required, produce evidence of his authorisation, and any warrant, before entering the premises, or at any time before leaving the premises. If an authorised officer exercises a power of entry for the purposes of obtaining information needed for the discharge of a fire and rescue authority’s functions under section 7, 8 or 9, he may take with him any other persons, and any equipment, that he considers necessary, and require any person present on the premises to provide him with any facilities, information, documents or records, or other assistance, that he may reasonably request. If an authorised officer exercises a power of entry for the purpose of investigating what caused a fire or why it progressed as it did, he may: take with him any other persons, and any equipment, that he considers necessary, inspect and copy any documents or records on the premises or remove them from the premises, carry out any inspections, measurements and tests in relation to the premises, or to an article or substance found on the premises, that he considers necessary, take samples of an article or substance found on the premises, but not so as to destroy it or damage it unless it is necessary to do so for the purpose of the investigation, dismantle an article found on the premises, but not so as to destroy it or damage it unless it is necessary to do so for the purpose of the investigation, take possession of an article or substance found on the premises and detain it for as long as is necessary for any of these purposes: to examine it and do anything he has power to do under paragraph (c) or (e), to ensure that it is not tampered with before his examination of it is completed, to ensure that it is available for use as evidence in proceedings for an offence relevant to the investigation, require a person present on the premises to provide him with any facilities, information, documents or records, or other assistance, that he may reasonably request. If an authorised officer takes samples of an article or substance found on the premises he must leave a notice