12In determining whether a person's service in any employment in which he is employed after 5th January 1964 qualifies him as mentioned in section 56(1)(a) of this Act, no account shall be taken of any service by him in that employment before that date.
13As respects service before 8th April 1963, section 56(3) of this Act shall have effect as if for the words "eighteen pounds" there were substituted the words " fifteen pounds ".
14As respects service before 6th January 1964, section 57(1) of this Act shall have effect as if for paragraph (d) thereof there were substituted the following—
“(d)apart from any period before pensionable age, the pension or the said part of it is of an amount not less, when expressed as a weekly rate, than the graduated retirement benefit which would be payable to the person employed in return for an amount of graduated contributions equal to one such contribution paid in each week of the period of service in respect of a weekly payment of remuneration of fifteen pounds.”