(1)A marketing scheme for regulating the marketing of white fish by persons carrying on the business of a home producer of white fish (hereafter in this Act referred to as " a producers' marketing scheme ") may provide—
(a)for determining from time to time—
(i)the quantity of white fish which may be sold by any person registered under the scheme;
(ii)the price, at, below or above which, and the terms on which, white fish or any quantity of white fish may be sold as aforesaid ;
(b)for determining the manner in which white fish is to be graded, packed, stored, adapted, offered or exposed for sale, or treated by or on behalf of persons registered under the scheme;
and the scheme may provide for determining any of the matters aforesaid either generally or in relation to particular areas or particular descriptions of white fish.
(2)If and so long determination of any of the matters mentioned in the preceding subsection, being a determination made, with respect to any class of persons, under provisions of a scheme which are authorised by that subsection, has effect in relation to any area or any description of white fish, any regulations of the Commission under this Part of this Act which provide for the determination of that matter in relation to that area or that description of white fish, shall, so far as those regulations apply to the same class of persons, be of no effect.