A chemical control order comes into force--
(a) if the order is specified to be an emergency chemical control order--(i) on the day the order is made, or(ii) if a later date is specified in the order--on the later date, or
(b) otherwise--(i) on the date specified in the order, or(ii) if the date specified is less than 21 days after the order is made--on the day that is 21 days after the order is made.