4. Every person to whom these Regulations apply, being a person who was immediately before the date of change a member of a pension fund held for the purposes of a pension scheme to which these Regulations apply or a member of the Society, as the case may be, may, with the consent of the Committee in whom the management of the fund or society is vested and the approval of the Commission, continue to be a member thereof so long as he remains in the service of the Authority and to be treated as having been such on and after the date of change in all respects as if his service with the Authority were service with the Commission.