Sch 3 para 10
(1) Where the occupier of premises to be entered and searched under a search warrant is present at the time when a relevant enforcement officer seeks to execute the warrant, the following requirements must be satisfied— (a) the occupier must be told the officer's name; (b) if not a constable in uniform, the officer must produce to the occupier documentary evidence that the officer is a relevant enforcement officer; (c) the officer must produce the warrant to the occupier; (d) the officer must supply the occupier with a copy of it. (2) Where the occupier of premises to be entered and searched under a search warrant is not present at the time when a relevant enforcement officer seeks to execute the warrant— (a) if some other person who appears to the officer to be in charge of the premises is present, sub-paragraph (1) has effect as if a reference to the occupier were a reference to that other person; (b) if not, the officer must leave a copy of the warrant in a prominent place on the premises.