161. (1) An authorisation given under—

(a) section 11(2), 12(2)(a), 13(2), 20(1)(b)(i), 24(3), 25(3)(i), 29(2), 34(2), 48(3) or 50(2),

(b) subsection (4) or (5) of section 21,

(c) subsection (4) or (5) of section 22,

(d) subsection (5) or (7)(a) of section 31,

(e) subsection (5) or (7)(a) of section 32,

(f) paragraph (a), (b) or (c) of section 36(3), or

(g) subsection (7)(a) or (8)(a) of section 38 ,

may be given orally but, if it is given orally, it shall be confirmed in writing as soon as practicable.

(2) The Minister may prescribe the form of any authorisation referred to in subsection (1).