130. The party in whose favour an order for costs is made may, within six years from the date on which it was made, apply to the court for the order to be varied on the ground that–
(a)material additional information as to the assisted person’s means, being information which could not have been obtained by that party with reasonable diligence at the time the order was made, is available; or
(b)there has been a change in the assisted person’s circumstances since the date of the order;
and on any such application the order may be varied as the court thinks fit; but save as aforesaid the determination of the court shall be final.