19.—(1) Subject to subsection (2) and section 20, leave granted to an employee under section 18 shall end—

( a ) in the case of leave granted to a pregnant employee, immediately before her maternity leave begins; and

( b ) in any other case, on the date on which she ceases to be an employee to whom this Part applies.

(2) Where an employee to whom leave is granted under section 18 is employed under a contract for a fixed term and that term expires before the day which, apart from this subsection, would be the day on which that leave would end, then—

( a ) the last day of the leave so granted to her shall he the day on which the term expires; and

( b ) nothing in this Part shall affect the termination of the employee's contract of employment on that day.