Case Updates

The trial dealt with liability issues relating to the alleged use of prohibited defeat devices. That is, devices which reduce the effectiveness of a vehicle’s emission control system for which there is no excuse or applicable exception. The judge criticised three of the expert witnesses for not complying with their duties under Part 35, and praised others.

The Claimant alleged that the Defendant was in breach of the agreement between the parties for the supply of single alpha chain collagen. The judge was critical of the Claimant’s expert witnesses, in particular noting that he would have had to direct further accounting expert evidence be produced, if the evidence had been required.

The claimant sought damages amounting to the difference between the £16.9 million contract sale price from a failed house sale and the sum ultimately obtained for the property of £10.1 million, less that £2.5 million forfeited deposit. After finding the expert evidence compromised by the information provided to the experts, the judge set out a better approach to expert evidence in property valuation.

The claimant was suing for the unpaid balance of the purchase price of assets used in its high-pressure aluminium diecasting business. The defendants’ expert received instructions that limited the scope of his investigation and analysis. While the judge accorded less weight to his evidence, he did not accept the claimant’s suggestion that the defendants’ expert ought to have either declined the instructions or proffered his opinion on wider valuation issues even in relation to issues outside of his instructions.

The claimant alleged that the second defendant, a Spanish racing driver, had repudiated a binding agreement under which he was contracted to drive for the claimants’ IndyCar team for the 2024, 2025 and 2026 racing seasons. The judge found some of the expert witnesses to be impressive and independent, while the expert evidence of others was unimpressive and disappointing.  

The task for the expert in this case was enormous. Capacity is issue specific. This means that if the issue is someone’s capacity to conduct legal proceedings, in this case sixteen sets of proceedings, the expert has to consider each set of proceedings. The person may have the capacity to conduct some and not others.

Johnston v Financial Ombudsman Service [2025] EWCA Civ 551

The Claimants brought an action against the Defendant, the Secretary of State for Education, for negligence and misfeasance in public office, relating to the actions of the Skills Funding Agency (‘SFA’), for which the Defendant is responsible. The Claimants alleged that the acts of SFA prevented them from selling their business for around £27 million, plus a lost chance of converting around £10 million in rollover loan notes.

The Defendant issued an application to revoke the Claimants’ permission to rely upon their forensic accounting expert evidence, because it had become clear that one of the Claimants, who was a trained accountant, had had significant secret involvement in the preparation of the expert’s report and the Joint Statement.

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 Claimant sought damages for clinical negligence from the Defendant who, she asserted, failed to diagnose red flag symptoms of cauda equina syndrome at a face to face consultation. The Claimant’s neurorehabilitation expert prepared his reports, engaged in an expert discussion, and signed the Joint Statement, without having seen the Claimant’s witness statement or the reports of other relevant experts.

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)