17.—(1) A person (P) begins pensionable service under this scheme in relation to a qualifying judicial office on the first day on which P becomes an eligible person in relation to service in that office unless—
(a)regulation 21 applies; or
(b)P is a transition member with continuity of service and paragraph (2) applies.
(2) This paragraph applies if—
(a)the first day on which P becomes an eligible person in relation to service in a qualifying judicial office is the day after P's transition date; and
(b)on P's transition date—
(i)P was in service in the same office; and
(ii)P has opted out of an existing scheme in relation to that service.