18.—(1) The Secretary of State may cancel an appropriate certificate issued in respect of a ship to which this paragraph applies, where the Secretary of State has reason to believe that—
(a)the appropriate certificate was issued on false or erroneous information, or
(b)since the completion of any survey required by these Regulations, the equipment or machinery of the ship has sustained damage or is otherwise deficient.
(2) The Secretary of State may require that an appropriate certificate issued in respect of a ship to which this paragraph applies, and which has expired or which has been cancelled, is to be surrendered within such time and in such manner as he may in writing direct.
(3) In relation to a ship to which this paragraph applies, no person may—
(a)intentionally alter an appropriate certificate,
(b)intentionally make a false appropriate certificate,
(c)knowingly or recklessly provide false information in connection with a survey required under these Regulations,
(d)with intent to deceive, use or lend an appropriate certificate or permit an appropriate certificate to be used by another person,
(e)fail to surrender an appropriate certificate where required to do so pursuant to paragraph (2), or
(f)in Scotland, forge an appropriate certificate.
(4) The owner and the master of a ship, in respect of which an appropriate certificate has been issued and to which this paragraph applies, must ensure that the certificate is readily available on board the ship for inspection at all times.