This was a significant and well reported patent case which was determined in the Intellectual Property List within the High Court last autumn.   

The technical aspects of the case required significant expert input from the panel involved.  The cross-examinations performed by leading Counsel for the parties were lengthy and complicated.  This led to confusion over what evidence was given when the transcripts were re-visited on subsequent trial days. The case shows how consideration should be given to experts who are being cross-examined so not to overload them with questions and information on the stand.

The Legal Aid Agency ('LAA') have updated their Guidance on the Remuneration of Expert Witnesses.

The aim of the new procedure is to ensure cases are properly pleaded before a trial date is assigned and to facilitate the earlier resolution of clinical negligence actions. This should in turn decrease legal costs.

Experts are advised, if possible, to avoid expressing opinions on the basis of possibility. The usually applicable stand of proof is the civil standard – the balance of probabilities or more probable than not. The criminal standard of proof is beyond reasonable doubt (and not beyond all reasonable [sic] doubt as it is sometimes misquoted). In this case it was submitted that the expert used the terms "possibility", "high possibility" and "extremely high possibility" interchangeably and that this was insufficient to satisfy the criminal standard of proof. However, when the court analysed the expert’s report as a whole, it was clear that a tribunal of fact could safely conclude that the criminal standard of proof was satisfied.

Government of Japan v Chappell [2025] EWHC 166 

The detail of this case is of relevance to dental experts and attention is drawn to the clarity and particularity with which Professor Harding set out the instances of treatment of the Claimant which was below the standard she could reasonably have expected and then identified the consequences thereof. There is a gastroenterological and pharmacological dimension to the case because it was alleged, and found, that the pain resulting from the negligent dental treatment necessitated treatment with NAISDs which caused ischaemic colitis. 

Bailey v Bijlani [2025] EWHC 175 (KB)

This is primarily a case for cardiologists, cardiac nurses and anaesthetists with a learning point for psychiatric experts. Viewed from outside the jurisdiction the striking feature of the case is that the plaintiff’s general practitioner records documenting a previous psychiatric history, which she had denied when assessed by the two psychiatric experts, were not disclosed to the defendant until five days into the trial.

Tynan v Bon Secours Health System Company Ltd by Guarantee [2025] IEHC 81 

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)

This case has a number of important features of general interest. It illustrates the importance of assessing the reliability of a subject’s account. This is not the same as advising the court as to the reliability of the subject. It is the reliability of the account that is being assessed, not the reliability of the person giving the account. This is why it is good practice to open the Opinion section of an expert report with an introductory section sometimes headed ‘Evaluation of evidence’ or sometimes ‘Clinical plausibility’. That there was no challenge to the reliability of the experts’ evidence is not surprising. They explained how they assessed the appellant and the duration of the assessments.

ZA v Cornetu District Court, Romania [2025] EWHC 595 (Admin)

In the 11th episode of the Expert Matters Podcast, we take a look at how AI is being used by Expert Witnesses. We discuss general developments related to AI in the legal sector, hear from EWI member and computer expert Richard Marshall, listen to some of the ways AI is currently being used by Expert Witnesses, and discuss some dos and don'ts when using AI. As usual, we begin with our segment on 'What's going on at EWI?' and end with 'Newsreel', a quick fire discussion of the key things you need to know this month. 

We have just refreshed our guidance on ‘Expert Discussions and Joint Statements' in the EWI Knowledge Hub (https://www.ewi.org.uk/Knowledge-Hub). Prepared with the input of members and the EWI Editorial Committee, the guidance includes lots of invaluable advice for navigating each of the key stages in expert discussions and joint statements, form and content, joint statement templates, and how to avoid the common pitfalls.