Increases in certain lump sums

4.—(1) This article applies to any lump sum or instalment of a lump sum which became payable on or after 8th April 2013 but before 7th April 2014.

(2) The pension authority may increase a lump sum or instalment of a lump sum to which this article applies by 2.7 per cent of the amount of the lump sum or instalment (as increased by the amount of any increase under section 2 of the 1971 Act or the existing orders) multiplied by

where A is the number of complete months in the period between the beginning date for the lump sum (or, if later, 8th April 2013) and the date on which it became payable.