In this Act—

• " accounting year " means any period of twelve months ending with 31st March or the period beginning with the commencement of this Act and ending with the next following 31st March;

• " biological substances " means substances whose purity or potency cannot, in the opinion of the Secretary of State, be adequately tested by chemical means;

• " the Board " means the National Biological Standards Board;

• " the Ministers " means the Secretary of State and the Head of the Department of Health and Social Services for Northern Ireland acting jointly.