13.—(1) This paragraph applies if a member (P) has paid a lump sum contribution for additional pension.
(2) The lump sum contribution must be refunded if, before the end of the refund period—
(a)P dies;
(b)an ill-health pension becomes payable to P; or
(c)P leaves all pensionable service and P is neither qualified nor re-qualified for retirement benefits in respect of that service.