peace is satisfied that it is necessary for the employee to enter premises without giving notice the sheriff or justice may issue a warrant authorising the employee to enter the premises at any time (by force if necessary). If an authorised employee exercises a power of entry by virtue of this section, the employee may take onto the premises such other persons and such equipment as the employee considers necessary, and require any person present on the premises to provide the employee with any facilities, information, documents or records, or other assistance that the employee may reasonably request. Before entering the premises, or at any time before leaving the premises, an authorised employee exercising a power of entry shall, if so required, produce evidence of the employee’s authorisation for the purpose of this section, and any warrant. Investigations into fires An employee of a fire and rescue authority who is authorised in writing by the authority for the purposes of section 29 [as explained above] may, at any reasonable time (by force if necessary), enter premises in which there has been a fire for the purpose of investigating what caused the fire, or why it progressed as it did. If an authorised employee exercises the power above the employee may: take onto the premises such other persons, and such equipment as the employee 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 an article or substance found on the premises, that the employee 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 retain it for as long as is necessary for the purpose of: examining it and doing anything the employee has power to do under the paragraphs above, ensuring that it is not tampered with before the employee’s examination of it is completed, or ensuring that it is available for use as evidence in proceedings for an offence