Article 4 Increase in certain lump sums
In respect of any lump sum or instalment of a lump sum which became payable before 10th April 2000 but after 11th April 1999 there may be paid an increase of 1.1 per cent of the amount of the lump sum or instalment (as increased by the amount of any increase under section 1 of the Act of 1971 or under the existing Orders) multiplied by—
where—
aA is the number of complete months in the period between the beginning date for the lump sum (or, if later, 12th April 1999) and the date on which it became payable; and
B is 12.