The appointment of an expert in family proceedings is governed by Part 25 of the Family Procedure Rules 2010 (FPR 2010), SI 2010/2955. Pursuant to FPR 2010, SI 2010/2955, 25.3 an expert has a duty to help the court on matters within their expertise, which overrides any obligation to the person instructing them. The court has a discretion as to whether each party should have their own experts, or whether under FPR 2010, SI 2010/2955, 25.11 a single joint expert should be instructed, which will often be the norm (FPR 2010, PD 25D, para 2.1). By FPR 2010, SI 2010/2955, 25.9 unless the court directs otherwise, expert evidence is to be given in a written report, with the parties being