4. After section 31 of the Principal Act the following section is inserted in Division 4 of Part III:
“32. (1) The Commissioner may, by notice in writing given to a member, retire the member from the Brigade.
“(2) The Commissioner shall not retire a member under subsection (1) unless—
(a) the Commissioner is satisfied that the member is an excess member; and
(b) the member has consented to the exercise of the power.
“(3) A member is an excess member for the purposes of paragraph (2) (a) if—
(a) the member is included in a class of members employed in the Brigade, being a class comprising a greater number of members than is necessary for the efficient and economical working of the Brigade; or
(b) the services of the member can not be effectively used because of technological or other changes in work methods of the Brigade or changes in the nature, extent or organisation of the functions of the Brigade.”.