43.—(1) Subject to paragraph (2), an application for a certificate under this Part shall not be granted unless—
(a)it is shown that there are reasonable grounds for taking, defending or being a party to the proceedings to which the application relates; and
(b)the applicant has signed an undertaking to pay any required contribution.
(2) An application for a certificate under this Part may be refused if, in the circumstances of the case, it appears to the Director—
(a)to be unreasonable that a certificate should be granted;
(b)to be more appropriate that an application for a certificate should be made under Part 4; or
(c)that only a trivial advantage would be gained by the applicant in taking, defending or being a party to the proceedings to which the application relates, or, owing to the simple nature of the proceedings, a supplier would not ordinarily be employed.