15.—(1) This Part applies to a person who—
(a)has become entitled to a retirement pension (a “previous pension”),
(b)after becoming so entitled entered further local government employment,
(c)has ceased to hold the further employment and has become entitled in relation to it to a retirement pension (an “additional pension”), and
(d)has not become entitled to the annual pension mentioned in Part II.
(2) In this Part “retirement pension” includes—
(a)a retirement pension under the 1992 regulations, and
(b)an annual pension under the former regulations.