7.—(1) The compensating authority shall, within a period of two years after the date on which any decision is notified to a claimant under paragraph 6 of this schedule, or if the claimant has referred any such decision to the tribunal under regulation 6, within a period of two years after the date of the decision of the tribunal, review their decision or the decision of the tribunal, as the case may be, at intervals of not more than six months, and on any review the compensating authority may, in the light of any material change in the circumstances of the case, award compensation or increase or reduce the amount of any compensation awarded.
(2) If the claimant obtains other employment within the said period of two years, he shall immediately notify the compensating authority in writing accordingly.
(3) A claimant to whom a decision under paragraph 6 of this schedule has been notified may, within the like period as is mentioned in sub-paragraph (1) of this paragraph, require the compensating authority to review their decision or the decision of the tribunal, as the case may be, if he considers that there has been a material change in the circumstances of his case.
(4) The compensating authority shall forthwith notify the claimant in writing of their decision on any review under the preceding provisions of this paragraph, and if the claimant is aggrieved by such decision he may refer the matter to the tribunal within three months after the date on which he receives notice of the decision, and the tribunal shall determine any matter so referred, and the compensating authority shall give effect to the determination of the tribunal.