Increase in certain lump sums
4. In respect of any lump sum or instalment of a lump sum which became payable before 12th April 2004 but on or after 7th April 2003 there may be paid an increase of 2.8 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, 7th April 2003 and the date on which it became payable; and
b
B is 12.