20(1)The law about the following matters, so far as relating to a warrant or other authorisation that may be included in a combined warrant, applies in relation to so much of a combined warrant as consists of such a warrant or authorisation—
(a)the duties imposed by section 2 (general duties in relation to privacy);
(b)any conditions that must be met before such a warrant or authorisation may be issued or given;
(c)the grounds on which such a warrant or authorisation may be issued or given;
(d)the conduct that may be authorised by such a warrant or authorisation;
(e)any requirements as to what must be included in such a warrant or authorisation;
(f)any conditions that must be met before such a warrant or authorisation may be renewed and the grounds on which it may be renewed;
(g)any conditions that must be met before such a warrant or authorisation may be modified;
(h)the grounds on which such a warrant or authorisation may be modified and the procedural rules that apply to such a modification;
(i)the circumstances in which such a warrant or authorisation may or must be cancelled.
(2)In sub-paragraph (1)(h) “procedural rules”, in relation to the modification of a warrant or other authorisation, means the law about any of the following matters—
(a)the involvement of Judicial Commissioners in decisions;
(b)the delegation of decisions;
(c)the signing of instruments making a modification;
(d)urgent cases.
(3)Sub-paragraph (1) is subject to paragraphs 21 to 26.