5.—(1) For the purpose of these Regulations, a person (P) leaves all pensionable service—
(a)if P is in pensionable service in relation to one employment only, when P leaves pensionable service in relation to that employment; or
(b)if P is in pensionable service in relation to more than one employment, when P leaves pensionable service in relation to all those employments.
(2) For the purpose of these Regulations, P leaves pensionable service in relation to an eligible employment when—
(a)P begins a period of non-pensionable family leave, non-pensionable sick leave or unpaid leave in relation to that employment;
(b)P opts out of this scheme in relation to that employment; or
(c)P leaves that employment.