5(1)The enforcement authority may at any time—
(a)withdraw a notice of intent or final notice,
(b)reduce an amount specified in a notice of intent or final notice, or
(c)amend a notice of intent or final notice to remove the requirement to pay an amount which the authority required to be paid under section 10(2), (5) or (8) or 11(1).
(2)The power in sub-paragraph (1) is to be exercised by giving notice in writing to the person on whom the notice was served.