NOTE: On 1 October 2026, a newly formed Business and Property Division replaces the Chancery Division—see News Analysis: The new Business and Property Division of the High Court. This Practice Note contains references to, and information derived from, the Chancery Guide. It is understood that a Business and Property Division Guide is being drafted and it is assumed this will replace the Chancery Guide. Existing links to the Chancery Guide will remain in content until a replacement is released. This Practice Note considers the relevance of expert evidence in claims proceeding in the Business and Property Division, experts’ duties, managing expert evidence (including CPR 35.4), single joint experts (SJEs), experts’ meetings, experts’ reports and the giving of expert evidence at trial whether concurrently (through ‘hot-tubbing’) or in the more traditional, adversarial, way. Managing expert evidence In addition to the general limitations on expert evidence under CPR 35, Chancery Guide, para 9.14 stipulates that the question is 'whether expert evidence is necessary or likely to be of assistance to the trial judge’. For further guidance on