Execution of warrants: evidence of authority
12.—(1) If the occupier of the business premises is present at the time when a named officer seeks to execute the warrant, the named officer must—
(a)identify themselves to the occupier; and
(b)produce to the occupier the warrant and documentary evidence that they are a named officer.
(2) If there is no person at the business premises when the named officer seeks to execute the warrant, the named officer must, before executing it—
(a)take such steps as are reasonable in all the circumstances to inform the occupier of the intended entry; and
(b)if the occupier is informed, afford the occupier or the occupier’s legal or other representative a reasonable opportunity to be present when the warrant is executed.
(3) If the named officer is unable to inform the occupier of the intended entry, the named officer must, on executing the warrant, leave a copy of it in a prominent place on the premises.