13.—(1) The condition is that the claimant is a severely disabled person.
(2) For the purposes of sub-paragraph (1), a claimant shall be treated as being a severely disabled person if, and only if–
(a)in the case of a single claimant or lone parent–
(i)he is in receipt of attendance allowance; and
(ii)subject to sub-paragraph (3), he has no non-dependants aged 18 or over residing with him; and
(iii)no-one is in receipt of an invalid care allowance under section 37 of the Social Security Act(1) in respect of caring for him;
(b)in the case of a claimant who has a partner–
(i)the claimant is in receipt of attendance allowance; and
(ii)his partner is also in receipt of such an allowance or, if he is a member of a polygamous marriage, all the partners of that marriage are in receipt of such an allowance; and
(iii)subject to sub-paragraph (3), the claimant has no non-dependants aged 18 or over residing with him;
and either there is someone in receipt of an invalid care allowance in respect of caring for only one of a couple or, in the case of a polygamous marriage for one or more but not all the partners of the marriage, or else there is no-one in receipt of such an allowance in respect of caring for either member of a couple or any partner of a polygamous marriage.
(3) For the purposes of sub-paragraph (2)(a)(ii) and (2)(b)(iii) no account shall be taken of either–
(a)a person receiving attendance allowance; or
(b)a boarder.
Section 137 was amended by the Social Security (Miscellaneous Provisions) Act 1977 (c. 5), section 22(2) and the Social Security Act 1986 (c. 50) sections 37 and 86 and Schedule 11.