18Where a designation applies this paragraph to any person—
(a)he shall have the powers of a constable under section 18 of the 1984 Act (entry and search after arrest) to enter and search any premises in the relevant police area and to seize and retain anything for which he may search under that section;
(b)subsections (5) and (6) of that section (power to carry out search before arrested person taken to police station and duty to inform senior officer) shall have effect in relation to any exercise by that person of those powers as if the references in those subsections to a constable were references to that person;
(c)section 19(6) of that Act (protection for legally privileged material from seizure) shall have effect in relation to the seizure of anything by that person by virtue of sub-paragraph (a) as it has effect in relation to the seizure of anything by a constable;
(d)section 20 of that Act (extension of powers of seizure to computerised information) shall have effect in relation the power of seizure conferred on that person by virtue of sub-paragraph (a) as it applies in relation to the power of seizure conferred on a constable by section 18(2) of that Act;
(e)section 21(1) and (2) of that Act (provision of record of seizure) shall have effect in relation to the seizure of anything by that person in exercise of the power conferred on him by virtue of sub-paragraph (a) as if the references to a constable and to an officer included references to that person; and
(f)sections 21(3) to (8) and 22 of that Act (access, copying and retention) shall have effect in relation to anything seized by that person in exercise of that power or taken away by him following the imposition of a requirement by virtue of sub-paragraph (d)—
(i)as they have effect in relation to anything seized in exercise of the power conferred on a constable by section 18(2) of that Act or taken away by a constable following the imposition of a requirement by virtue of section 20 of that Act; and
(ii)as if the references to a constable in subsections (3), (4) and (5) of section 21 included references to a person to whom this paragraph applies.