It is not easy to appreciate the significance of this judgment for experts in general without reading the summary so the ‘Commentary’ is at the end. The neuropsychological test results are perhaps not of particular interest to psychologists and psychiatrists at this stage in the proceedings but may become so if the case does not settle and it goes to trial. 

Perrin v Walsh (Rev1) [2025] EWHC 2536 (KB)

The judgement from The Honourable Mr Justice Trower asserts that Expert Witnesses have a duty to disclose previous criticisms of their evidence in judgments.

In the 14th episode of the Expert Matters Podcast, Simon and EWI's Marketing and Events Manger, Heather George, reflect on their highlights from EWI's 2025 Annual Conference which was held on 20 June. The Conference featured a great line-up of panels and speakers, with keynote speeches from Lady Rose, Justice of the Supreme Court, and Lord Justice Birrs, the Deputy Head of Civil Justice. A wide range of lawyers, judges and expert witnesses joined the panel sessions, and EWI member Dr Richard Marshall provided an insightful session on AI and the Expert Witness. You can also check out our 'What's going on at EWI' and 'Newsreel' segments to keep up-to-date on the latest developments in the world of expert witnesses and expert evidence. 

Few reported cases assist as to expert evidence in cases of harassment and on the issue of injury to feelings as distinct from psychiatric injury. This summary should be read for this reason. It illustrates how the expert should respond to less than neutral instructions. It illustrates how cardiological evidence was analysed in order for the court to conclude that the defendant’s course of conduct had caused a myocardial infarction. It also reveals the charitable aspect of pro bono legal practice.   

Wei v Long [2025] EWHC 912 (KB)

The claimants, who carried on a business breeding falcons, made allegations of harassment and nuisance against their neighbour, who operated a small farm neighbouring their property. While the judge accepted some of the claimants’ criticisms of one of the defendants’ experts, he also noted that the claimants could not complain about the consequences of their putting in new evidence that was not in accordance with the timetable laid down at the CCMC.

The detail of this judgment is for experts who conduct capacity assessments. Two points arise of more general interest.

First, the expert, who had been involved in the case for six years, changed her opinion. In the language of the court it was a 180^o degree change. The court thought that this called for a greater discussion in the analysis section of the report. This seems to have been that section of the report for which experts use the heading ‘Facts and assumed facts’ or ‘Factual analysis’. Second, the expert suggested that the issues, or some of the issues, in the case could be resolved by invoking the inherent jurisdiction of the court. But there had been no application for the exercise of the court's inherent jurisdiction, it was not referred to in the letter of instruction, and it might not – as a matter of law – have been available. This is a good example of the advice to experts to leave the law to the lawyers.  

Calderdale Metropolitan Borough Council v LS [2025] EWCOP 10 (T3)

While there are many respectable and legitimate expert witness agencies who provide brilliant support to the expert witnesses who work with them, the EWI has had continuing reports of the activities of some unethical agencies who prey upon experts who do not have a good understanding of expert witness work or who may be vulnerable to such approaches for other reasons. We do not want any expert to fall victim to an unscrupulous agency, so we have prepared a short guide setting out the red flags to watch out for in the approach of an unethical agency and, conversely, the sorts of positive signs to expect from a respectable and legitimate agency, including a quick checklist to complete. 

This is an important judgment for experts who prepare personal injury reports in the Republic of Ireland but also for all experts, in all of the jurisdictions in the British Isles, for its description of the judicial analysis of expert evidence. It deals with procedure in Ireland for the instruction of specialist medical experts through plaintiffs’ general practitioners.   

Lynch v Motor Insurers' Bureau of Ireland [2024] IEHC 587 

The father sought permission to rely on fresh evidence that he had a diagnosis of autism spectrum disorder in an appeal against care and placement orders made in respect of his daughter. The judge reviewed the law on admitting fresh evidence on appeal before applying it to the case.

Earlier this year, we asked our members about the single biggest change they’ve seen since they started practicing as an Expert Witness. With members from numerous disciplines who’ve been practicing from 40 years to 4 months, we expected a wide variety of insights, and we weren’t disappointed.