The sum which a local authority shall under section 22(4) of the Act assume that a person needs for his personal requirements shall be £8.25 per week except that, where that person is someone to whom there is payable attendance allowance under the provisions of section 35 of the Social Security Act 19755or constant attendance allowance under any Personal Injuries Scheme, Service Pensions Instrument or any 1914-18 War Injuries Scheme, the said sum of £8.25 shall in respect of each week there is payable attendance allowance or constant attendance allowance be increased by the amount of such allowance.