Paragraph 8 Calculation of increase

The portion of the increasable rate of the pension allocated under paragraph 4 to each period specified in paragraph 1 beginning on or after 1 April 1969 shall be increased under Part I of the Act as if it were the increasable rate of a pension which began at the date when the period began; except that the portion for the period specified in paragraph 1(a) (where it begins on or after 1 April 1969) shall be increased as if it were the increasable rate of a pension which began on the last relevant date before the commencement of the period of contributory service.