This Practice Note provides guidance on the enforcement of an undertaking either for the payment of money, or to do or abstain from doing any act other than the payment of money. It also considers the requirements in contempt proceedings in the event of the breach of an undertaking. The key provisions on the enforcement of undertakings are set out in Family Procedure Rules 2010 (FPR 2010), SI 2010/2955, Pts 33 and 37, together with FPR 2010, PD 33A and FPR 2010, PD 37A. With effect from 1 October 2020, FPR 2010, SI 2010/2955, Pt 37, together with FPR 2010, PD 37A, were substituted. Amendments were also made to FPR 2010, PD 33A from 1 October 2020 to reflect the amendments to FPR 2010, SI 2010/2955, Pt 37 and to FPR 2010, PD 37A. The substituted Part 37 does not alter the scope and extent of the jurisdiction of courts determining contempt proceedings (whether inherent, statutory or at common law) and has effect subject to, and to the extent that it is consistent with, the substantive law