# Serious Crime Act 2015, Paragraph 1


(1) A search and seizure warrant may be executed by any police or customs officer.
(2) A search and seizure warrant may authorise persons to accompany any police or customs officer who is executing it.
(3) A person authorised under sub-paragraph (2) has the same powers as the police or customs officer whom he or she accompanies in respect of—
(a) the execution of the warrant;
(b) the seizure of anything to which the warrant relates.
But the person may exercise those powers only in the company, and under the supervision, of a police or customs officer.

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Source: https://www.legislation.gov.uk/ukpga/2015/9/schedule/2/paragraph/1 (the official version)
Page: https://openlegislation.uk/serious-crime-act-2015/schedule-2/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.