5.—(1) If a final decision is referred to a medical authority for reconsideration under paragraph 3 or 4 and the medical authority is unable or unwilling to act, the final decision may be referred to an appointed medical practitioner.
(2) The decision of an appointed medical practitioner has effect as if it were that of the medical authority who gave the final decision.
(3) In this paragraph, “appointed medical practitioner” means a duly qualified medical practitioner or a board of duly qualified medical practitioners—
(a)agreed by the member and the employer; or
(b)appointed by the sheriff or tribunal.