The Scottish Ministers may by regulations prescribe—
(a)the form in which—
(i)authorisation by virtue of section 30(2), 32(2) or 33(1);
(ii)authorisation by a person nominated in accordance with section 30(1) or 32(1),
is to be given;
(b)the form in which authorisation by virtue of section 43(1), 45(1) or 46(1) may be given;
(c)descriptions of persons who are eligible to act as a witness in accordance with section 29(2)(b), 30(4) or (5), 31(2)(a), 32(4) or (5), 33(2)(a), 43(2)(a), 44(2)(a), 45(2)(a) or 46(2)(a).