4.—(1) Any person who requires the pattern or construction of a meter or its manner of installation to be approved shall submit to the Director—
(a)an application containing the information specified in the Schedule and signed by that person; and
(b)not less than three meters of the pattern or construction and containing the components described in the application.
(2) References in this regulation to the pattern or construction of a meter or to the manner of its installation include references to a modification of a pattern or construction or of a manner of installation which has previously been approved in accordance with these Regulations.