52. For the purposes of section 20(3) an appeal tribunal may not carry out a physical examination except in a case which relates to—
(a)the extent of a person’s disablement and its assessment in accordance with section 68(6) of, and Schedule 6 to, the Contributions and Benefits Act;
(b)the extent of a person’s disablement and its assessment in accordance with section 103 of that Act;
(c)diseases or injuries prescribed for the purposes of section 108 of that Act.