8 Contents of warrants.U.K.
(1)An interception warrant must name or describe either—
(a)one person as the interception subject; or
(b)a single set of premises as the premises in relation to which the interception to which the warrant relates is to take place.
(2)The provisions of an interception warrant describing communications the interception of which is authorised or required by the warrant must comprise one or more schedules setting out the addresses, numbers, apparatus or other factors, or combination of factors, that are to be used for identifying the communications that may be or are to be intercepted.
(3)Any factor or combination of factors set out in accordance with subsection (2) must be one that identifies communications which are likely to be or to include—
(a)communications from, or intended for, the person named or described in the warrant in accordance with subsection (1); or
(b)communications originating on, or intended for transmission to, the premises so named or described.
(4)Subsections (1) and (2) shall not apply to an interception warrant if—
(a)the description of communications to which the warrant relates confines the conduct authorised or required by the warrant to conduct falling within subsection (5); and
(b)at the time of the issue of the warrant, a certificate applicable to the warrant has been issued by the Secretary of State certifying—
(i)the descriptions of intercepted material the examination of which he considers necessary; and
(ii)that he considers the examination of material of those descriptions necessary as mentioned in section 5(3)(a), (b) or (c).
(5)Conduct falls within this subsection if it consists in—
(a)the interception of external communications in the course of their transmission by means of a telecommunication system; and
(b)any conduct authorised in relation to any such interception by section 5(6).
(6)A certificate for the purposes of subsection (4) shall not be issued except under the hand of the Secretary of State.