12.—(1) If, after the date of the confirmation document (whether or not the period of carer’s leave to which it relates has commenced) the employer and the employee so agree—

(a) the carer’s leave or part of it may be postponed to such time as may be so agreed between the parties,

(b) the period of carer’s leave may be curtailed in a manner and to an extent as may be so agreed between the parties, or

(c) the form of the carer’s leave may be varied in a manner as may be so agreed between the parties,

and the confirmation document shall be amended in accordance with such agreement.

(2) Where carer’s leave is postponed, curtailed or varied the period of carer’s leave that is not taken by reason of such postponement, curtailment or variation may, subject to section 6, be taken at another time.