Section 45A

it appears to the Minister that a decision of the Commission or of the United Nations Organization to alter any of the

Schedules to the Single Convention or to apply to a substance, measures of control applicable under that

Convention to substances specified in Schedule 1 thereto, requires the addition of a substance to the First Schedule; or

it appears to him probable that there will be taken such a decision as aforesaid of the Commission or of the United

Nations Organization as will require the addition of a substance to the First Schedule and that, in the circumstances of the case, it is expedient to anticipate the decision; or

he considers it expedient to add a substance to, or remove a substance from, or vary the First Schedule, he may by order make the requisite modifications in the said First

Schedule.