Section 39 of the Principal Act is hereby amended -

(a) by the substitution for subsection (2)(a) of the following -

"(a) a chairman who before his appointment shall have had not less than 7 years' experience as a practising barrister or practising solicitor,",

and

(b) by the substitution for subsection (2)(c) of the following -

"(c) not less than 12 and not more than 24 ordinary members.".