5.—(1) The Department may in appropriate circumstances and at any time—
(a)vary the boundary of any area designated under regulation 3(1) or 4;
(b)impose any limitation, restriction or condition on the use of any area designated under regulation 3(1) or 4;
(c)alter the class of any designated bivalve production area or any area within a designated bivalve production area;
(d)revoke the designation of a designated bivalve production area, if the area is no longer suitable for the gathering of live bivalve molluscs;
(e)vary or revoke the designation of any area designated under regulation 4.
(2) A district council may at any time—
(a)in appropriate circumstances, vary the designation of a relaying area made under regulation 3(2);
(b)if a relaying area designated in accordance with regulation 3(2) is no longer suitable for the relaying of live bivalve molluscs, revoke the designation of that relaying area,
and shall communicate any such variation or revocation to the Department.