The claimant alleged both negligence and breach of contract by the defendant designer of a container park near Felixstowe Port. The judge set out the reasons why she was not impressed by the claimant’s expert and treated his evidence with significant caution.

MJS Projects (March) Limited v RPS Consulting Services Limited [2025] EWHC 831 (TCC)

The claimant brought a clinical negligence claim against two general practitioners alleging that they failed to act on a potential diagnosis of pelvic inflammatory disease. The judge found that one of the GP experts had trespassed on the judicial function to determine the facts and had sought to advocate on behalf of the second defendant.

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 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)

The expert paediatrician in this case misidentified and confused twins when reading the primary medical disclose. This fundamental error was of seminal importance in this case because the twins had very different birth and post-birth experiences, with one being much weaker and more vulnerable than the other.  The judge noted that the cross-examination of the expert was nothing short of a demolition of the expert’s evidence.

LB Croydon v D (critical scrutiny of the paedeatric overview)

The judge preferred the evidence of the Claimant's expert because of the Defendant's expert’s approach to his task as expert, his confusion over the proper approach to what prior art was and was not in the common general knowledge, the number of assertions he made which he was forced to resile from as incorrect, and his failure to acknowledge a key fact.

The judge found that the forensic accounting expert’s approach of forming an opinion as to the value of the Company, then carrying out a detailed calculation and only if it matches his initial opinion accepting it, undermined the credibility and reliability of his opinion as to the value of the Company.

In the 8th episode of the Expert Matters Podcast, we discuss re-evaluating your opinion. We look at possible reasons why you might wish to re-evaluate your opinion and the stages in the proceedings where re-evaluation is most likely to occur, before hearing from three senior judges on how re-evaluating your opinion can sometimes be positive for your expert evidence, but may also be disastrous. 

The Appellant was given permission to change neurology experts after the judge found that the application was not so late as to be prejudicial to the Respondents, and that the Appellant was not engaging in expert shopping.

In the last podcast for 2024, we look back at the ten key issues for expert witnesses that we've seen over the course of 2024, and highlight the ten things to look out for in 2025. From knowing and complying with your duties, to reevaluating and changing you opinion and handling fundamental dishonesty, this year in review has it all.