Article 4 Increases in certain lump sums
In respect of any lump sum or instalment of a lump sum which became payable before 12th November 1979 but after 1st December 1978 there may be paid an increase of 17.5 per cent. 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, 1st December 1978 and the date on which it became payable; and
(b)
B is 12.