The Secretary of State may, after consultation with the industry body—
limit any price which may be charged by any manufacturer or supplier for the supply of any health service medicine, and
provide for any amount representing sums charged by that person for that medicine in excess of the limit to be paid to the Secretary of State within a specified period.
If at any time a health service medicine is covered by a voluntary scheme applying to its manufacturer or supplier, the powers conferred by this section may not be exercised at that time in relation to that manufacturer or supplier as regards that medicine.