9. For regulation 15(10) (entitlement under special rules for terminal illness) substitute—
“(10) Where an individual has previously received Child Disability Payment for a period and a determination is subsequently made that the same individual is entitled to Child Disability Payment at a higher rate for that period by virtue of this regulation, that individual will be entitled to the difference between the value of entitlement to Child Disability Payment under the subsequent determination and the value of Child Disability Payment to which that individual was previously entitled for that period.”.