(1) The rate (in this Chapter referred to as "the scheduled rate") of disability allowance shall be the weekly rate set out in column (2) of Part 1 of Schedule 4 increased by -
(a) the amount set out in column (3) of that Part for any period during which the claimant or beneficiary has a qualified adult, subject to the restriction that, except where regulations otherwise provide, the claimant or beneficiary shall not be entitled to an increase under this paragraph in respect of more than one person,
(b) the appropriate amount set out -
(i) in column (4) of that Part in respect of each qualified child who has not attained the age of 12 years who normally resides with the claimant or beneficiary, and
(ii) in column (5) of that Part in respect of each qualified child who has attained the age of 12 years who normally resides with the claimant or beneficiary,
(c) the amount set out in column (6) of that Part where the claimant or beneficiary is living alone, and
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