Paragraph 5
As soon as an employing authority receive a notice under paragraph 1 they shall forward it to the appropriate administering authority.
The appropriate administering authority shall give effect to a notice under paragraph 1 as soon as reasonably practicable, and in any event—
in the case of a notice under paragraph 1(1), so that the member may begin to pay his contributions under paragraph 4 before the expiry of the period of six months beginning with the date on which he gives notice, and
in the case of a notice under paragraph 1(2), so that the member may pay his contributions at the varied amount or in the varied proportions, or, as the case may be, cease to pay his contributions, before the expiry of the period of three months beginning with that date.