As respects the year of assessment 2000-2001 and subsequent years of assessment, the Principal Act is amended -

(a) by the substitution of the following for section 464:

"464. Age allowance.

(1) In this section -

'appropriate percentage', in relation to a year of assessment, means a percentage equal to the standard rate of tax for that year;

'specified amount', in relation to an individual for a year of assessment, means -

(a) £1,600, in a case where the individual is a married person whose spouse is living with him or her and who is assessed to tax in accordance with section 1017 and

(b) £800, in any other case.

(2) Where for any year of assessment an individual is entitled to a reduction of income tax under section 461 and proves that at any time during that year of assessment -

(a) the individual, or

(b) in the case of a married person whose spouse is living with him or her and who is assessed to tax in accordance with section 1017, either the individual or the individual's spouse,

was of the age of 65 years or over, the income tax to be charged on the individual, other than in accordance with section 16(2), for that year of assessment shall be reduced by a further amount which is the lesser of -