Where—
(a)a person becomes entitled to an invalidity pension or a severe disablement allowance by virtue of section 33(7), 42 or 68(10) above; and
(b)when he was last entitled to that pension or allowance, it was increased in respect of a dependant by virtue of—
(i)regulation 8(6) of the [S.R. (N.I.) 1977 No. 74.] Social Security Benefit (Dependency) Regulations (Northern Ireland) 1977;
(ii)regulation 3 of the [S.R. (N.I.) 1984 No. 373.] Social Security Benefit (Dependency) (Amendment) Regulations (Northern Ireland) 1984;
(iii)regulation 2 of the [S.R. (N.I.) 1984 No. 381.] Social Security (Savings for Existing Beneficiaries) Regulations (Northern Ireland) 1984; or
(iv)regulation 4 of the [S.R. (N.I.) 1989 No. 381.] Social Security Benefit (Dependency and Computation of Earnings) (Amendment) Regulations (Northern Ireland) 1989,
for the purpose of determining whether his pension or allowance should be increased by virtue of that regulation for any period beginning with the day on which he again becomes entitled to his pension or allowance, the increase in respect of that dependant shall be treated as having been payable to him on each day between the last day on which his pension or allowance was previously payable and the day on which he again becomes entitled to it.