Refusal to be medically examined
H4. If a question is referred to a medical authority under Regulation H1, H2 or H3 and the person concerned wilfully or negligently fails to submit himself to such medical examination or to attend such interviews as the medical authority may consider necessary in order to enable him to make his decision, then—
(a)if the question arises otherwise than on an appeal to a medical referee, the police authority may make their determination on such evidence and medical advice as they in their discretion think necessary;
(b)if the question arises on an appeal to a medical referee, the appeal shall be deemed to be withdrawn.