6.—(1) For the purpose of this Schedule, a person (P) is an active member of an existing scheme(1) (other than the 1992 Scheme or the NFPS) on a given date if on that date—
(a)P is in pensionable service under that scheme; or
(b)P is on a gap in service not exceeding five years.
(2) For the purpose of sub-paragraph (1)(b), after the closing date for the existing scheme P is not on a gap in service while P is in pensionable public service.
See section 18(2) of the 2013 Act for the meaning of “existing scheme”.