(1) This regulation applies where the matter is to be investigated in accordance with regulation 14.
(2) The appropriate authority must appoint a person to investigate the matter.
(3) No person may be appointed to investigate a matter under this regulation—
(a) unless they have an appropriate level of knowledge, skills and experience to plan and manage the investigation;
(b) if they are an interested party;
(c) if they work, directly or indirectly, under the management of the officer concerned, ...
(d) in a case where the officer concerned is a senior officer, if they are—
(i) the chief officer of police of the police force concerned;
(ii) a member of the same police force as the officer, or where the officer is a member of the metropolitan police force, serving in the same command as the officer, or
(iii) a designated police volunteer serving in that force.
(4) The reference in paragraph (3)(d)(ii) to a member of the police force includes a reference to a special constable appointed for the area of that force and a police staff member serving in that force.
(5) In this regulation, “interested party” means a person whose appointment could reasonably give rise to a concern as to whether a person could act impartially under these Regulations.