18.—(1) When a temporary control zone has been declared, the Scottish Ministers may also declare a supplementary movement control zone which–
(a)shall be of such size as they consider fit to prevent the spread of disease; and
(b)shall include that temporary control zone.
(2) An area shall remain a supplementary movement control zone (or part of one) until–
(a)it becomes part of a protection zone or a surveillance zone;
(b)the declaration of the temporary control zone included within it ceases to have effect;
(c)the Scottish Ministers amend the declaration of the supplementary movement control zone so as to exclude that area; or
(d)the Scottish Ministers revoke the declaration of the supplementary movement control zone.
(3) Any amendment or revocation of a declaration creating a supplementary movement control zone shall refer to that declaration and state the date and time it is to take effect.
(4) Any premises which are partly inside and partly outside a supplementary movement control zone shall be deemed to be wholly inside it.
(5) A supplementary movement control zone applies in respect of–
(a)susceptible animals; and
(b)any class of non susceptible animal specified in the declaration in question during a period also specified in that declaration which period shall not exceed 72 hours from the time the declaration was made.