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21.—(1) Subject to paragraphs (2) and (3)—
(a)it shall be the duty of every weights and measures authority in Great Britain to enforce regulation 17 within its area; and
(b)it shall be the duty of the Department of Enterprise Trade and Investment in Northern Ireland to enforce regulation 17 within Northern Ireland.
(2) No proceedings for an offence under these Regulations may be instituted in England and Wales except by or on behalf of an enforcement authority.
(3) Nothing in paragraph (1) shall authorise any weights and measures authority to bring proceedings in Scotland for an offence.