For the purposes of section 9 the parties to an agreement falling within subsection (1) or (2) of that section apply for an apportionment to become binding on the appropriate person if, either before or within the period of four weeks beginning with the date of the assignment in question, they serve on that person a notice informing him of—
Where an application for an apportionment to become binding has been made in accordance with subsection (1), the apportionment becomes binding on the appropriate person if—
Where any apportionment becomes binding in accordance with this section, this shall be regarded as occurring at the time when the assignment in question takes place.
In this section—
"the appropriate person" has the same meaning as in section 9;
"the court" means the county court ;
"prescribed" means prescribed by virtue of section 27.