“(3) In this section ‘registration officer’ means—

(a) an officer of the Board appointed in writing by the Board, or

(b) an employee of a contractor appointed in writing by the contractor,

to be a registration officer for the purposes of this section.

(4) A registration officer who is an employee of a contractor shall cease to be a registration officer upon the termination of any contract made between the Board and the contractor who employs the employee.

(5) The Board may, where it considers a registration officer who is an employee of a contractor is not performing the functions of a registration officer in a satisfactory manner, revoke the appointment of the officer.”.