Section 18 of the Principal Act is amended, in subsection (3), by the substitution of the following paragraphs for paragraphs (a) and (b):

"(a) not arrange for the making of an assessment of, or the carrying out of mediation in relation to, the relevant claim concerned, or

(b) if any step in the making of that assessment or carrying out of that mediation, or consequent on the making of that assessment or carrying out of that mediation, has already been taken, cause no further step to be taken in the making of that assessment or carrying out of that mediation or consequent on its making or carrying out,".