13.—(1) This regulation applies where the matter is to be investigated in accordance with regulation 12.
(2) The appropriate authority shall, subject to paragraph (3), appoint a person to investigate the matter.
(3) If the officer concerned is the Commissioner of Police of the Metropolis or the Deputy Commissioner of Police of the Metropolis—
(a)the appropriate authority shall notify the Secretary of State; and
(b)the Secretary of State shall appoint a person to investigate the matter.
(4) No person shall be appointed to investigate the matter under this regulation—
(a)unless he has an appropriate level of knowledge, skills and experience to plan and manage the investigation;
(b)if he is an interested party;
(c)if he works, directly or indirectly, under the management of the officer concerned; or
(d)in a case where the officer concerned is a senior officer, if he is—
(i)the chief officer of police of the police force concerned; or
(ii)a member of the same police force as the officer concerned, or where the officer concerned is a member of the metropolitan police force, serving in the same division as the officer concerned.
(5) The reference in paragraph (4)(d)(ii) to a member of the police force shall include a reference to a special constable appointed for the area of that force and a police staff member serving in that force.