An undertaking with a penal notice attached may be enforced by way of committal proceedings. The application is made using the procedure under Family Procedure Rules 2010 (FPR 2010), SI 2010/2955, Pt 18 (FPR 2010, SI 2010/2955, r 37.10). The application notice under FPR 2010, SI 2010/2955, Pt 18 is FP2, Application notice, FPR 2010, SI 2010/2955, Pt 18, and the application will need to be accompanied by an affidavit containing all the evidence that the applicant seeks to rely on. The fee is £155 (Family Proceedings Fees Order 2008, SI 2008/1054, fee 5.3). Personal service of the application is required. Before commencing