3.—(1) A person shall not carry out any work in relation to a gas fitting or gas storage vessel unless he is competent to do so.
(2) The employer of any person carrying out such work for that employer shall ensure that paragraph (1) is complied with.
(3) Without prejudice to the generality of paragraphs (1) and (2), and subject to paragraph (4), an employer shall not allow any of his employees to carry out any work in relation to a gas fitting or service pipework and a self-employed person shall not carry out any such work, unless the employer or self-employed person, as the case may be, is a member of a class of persons approved for the time being by the Department for the purposes of this paragraph.
(4) The requirements of paragraph (3) shall not apply in respect of the replacement of—
(a)a hose or regulator on a portable or mobile space heater; or
(b)a hose connecting a refillable cylinder to installation pipework.
(5) An approval given pursuant to paragraph (3) (and any withdrawal of such approval) shall be in writing and notice of it shall be given to such persons and in such manner as the Department considers appropriate.
(6) The employer of any person carrying out any work in relation to a gas fitting or gas storage vessel in the course of his employment shall ensure that such of the following provisions of these Regulations as impose duties upon that person and are for the time being in operation are complied with by that person.
(7) A person shall not falsely pretend to be a member of a class of persons required to be approved under paragraph (3).