Regulation 62 Period to be taken into account by assessments revised on ground of unforeseen aggravationI1

if the review was in consequence of an application by a claimant, or a person acting on his behalf, the date of that application; or

if the review was in consequence of a decision on a recrudescence question, within the meaning of regulation 43(3)(b) given under regulation 7(4) of the Prescribed Diseases Regulations (recrudescence of a prescribed disease), the date of the claim on which that decision was given, if the medical board are satisfied that throughout that period there has been unforeseen aggravation of the results of the relevant injury since the making of the assessment under review.