Increase in certain lump sums

4.  In respect of any lump sum or instalment of a lump sum which became payable before 9th April 2001 but on or after 10th April 2000 there may be paid an increase of 3·3 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—

a

A is the number of complete months in the period between the beginning date for the lump sum or, if later, 10th April 2000 and the date on which it became payable; and

b

B is 12.