If there are 2 or more respondents as respects a relevant claim and one or more but not all of them makes a statement in writing of the kind referred to in section 14(2) the following provisions have effect -

(a) the Board, despite the making of such a statement, shall, subject to sections 17 and 18, arrange for an assessment to be made under section 20 of the claimant's relevant claim,

(b) the assessment made under that section, though subsequently accepted, if such be the case, by the other respondent or respondents, shall not be binding on the respondent or respondents who made such a statement, (the “non-participating respondent or respondents”), and

(c) section 14 shall have effect as if the following subsections were substituted for subsection (4):