6After section 135 of the Local Government (Scotland) Act 1973 (establishing river purification areas and boards) there shall be inserted the following section—
“135AVariation of composition of river purification boards
(1)The power to make an order under subsection (5) of section 135 of this Act includes power to vary the composition of any river purification board, in accordance with the provisions of this section, in a subsequent order.
(2)Such a variation order shall provide—
(a)that any river purification board shall consist of such number of members as may be specified in the order;
(b)that one quarter of the members of the board shall be appointed from among their members by such of the regional councils wholly or partly within the area of the board and in such proportions as may be so specified;
(c)that one quarter of the members of the board shall be appointed from among their members by such of the district councils wholly or partly within the area of the board and in such proportions as may be so specified; and
(d)that one half of the members of the board shall be appointed by the Secretary of State, after consultation with such bodies as he thinks fit, to represent the interests of persons concerned with the carrying on of agriculture, fisheries or industry in the board’s area or any other interests which, in the opinion of the Secretary of State, should be represented on the board.
(3)Such a variation order may make such transitional provisions with regard to the termination and appointment of members, including members appointed by regional or district councils, as the Secretary of State thinks appropriate.”.