PART 3  Composition and proceedings of the Authority  Duty to appoint members and number of members  Appointment of a relevant police and crime commissioner as a member of the authority  Arrangement for another person to attend meetings on behalf of the relevant police and  crime commissioner  Office of Authority members  Appointment of relevant police and crime commissioner as Authority member  4 10. —(1) A relevant police and crime commissioner appointed as a member of the Authority  under paragraph 8—  9.  A member of the Authority appointed under paragraph 7 comes into office on the date of their  appointment and, subject to paragraphs 11 to 13, holds office for such period or periods as  determined by the constituent authority which appoints them.  (2) Where this sub-paragraph applies, the person attending the meeting on behalf of the relevant  police and crime commissioner may speak at that meeting but—  8. —(1) Sub-paragraph (2) applies where a relevant police and crime commissioner—  (3) If the Authority receives a request from a relevant police and crime commissioner, it must—  (2) But the Authority may only make such an appointment in response to a request from the  relevant police and crime commissioner.  7. —(1) The Authority may appoint a relevant police and crime commissioner to be a member of  the authority.  (5) Each member of the Authority is appointed in accordance with this Part.  (4) Thereafter the number of members may be determined by the Authority but must not exceed  25.  (3) On 1st April 2021 there must be 11 members of the Authority.  (2) In determining the number of members to be appointed by each constituent authority, the  Authority must, so far as practicable, ensure that the number of members is proportionate to the  number of local government electors in their area in relation to the number of such electors in the  areas of each of the other constituent authorities.  6. —(1) Each constituent authority must appoint as members of the Authority such number of  members of the constituent authority as determined by the Authority.  (a) consider the request;  (b) agree to or refuse the request;  (c) give reasons for its decision to agree to or refuse the request, and  (d) publish those reasons in such manner as it thinks appropriate.  (a) may not vote, and  (b) is not to be treated as a member of the Authority for any purpose.  (b) arranges, under section 18 of the 2011 Act, for another person to attend a meeting of the  Authority on the relevant police and crime commissioner’s behalf.  (a) is appointed as a member of the Authority, and  (a) comes into office on the date of that appointment, and 