28 July 2026 Sean Mosby 1018 Case Updates Trinsic Collagen Limited v Procoll Limited [2026] EWHC 1793 (Ch) by Sean Mosby Summary 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. Learning points Learning points for instructing parties If you provide an expert with additional factual material or assumptions on which to rely, it is important for this material to be clearly identified both to the other party and the court. Learning points for experts Make sure you set out the information you have relied on and show your workings so that the court can understand how you have reached your conclusions. Ensure that all the assumptions you have made in forming your opinion are either clearly set out in your report or in the instructions included with the report. Try to obtain the actual numbers (e.g. numbers of sales) before choosing to rely on assumptions. To continue reading you must be an EWI member, become a member and access exclusive content. Already a member? Login More links Link to the Judgment Share Print Tags 06. Rules and Regulations11. Report Writing08. Working with Instructing Parties13. Experts Discussions and Joint Statements15. Giving Oral Evidence Related articles Instructed Late, Judged Early: What the Ciarb 2026 report on expert witnesses asks of experts, tribunals and counsel A medical report to which the court gave little weight DLP Ltd v Coram UK Holding Ltd [2026] EWHC 2448 (IPEC) (25 September 2026) Information publicly available on the internet - 'Digital Open Source Information' A Day in the Life of an Oil and Commodities Expert Witness Switch article Nord Stream AG v Lloyd's Insurance Company SA & Anor Neutral Citation Number[2026] EWHC 1685 (Comm) Previous Article The Digital Footprint: An Overlooked Source of Expert Evidence — Lessons from Shaheen and Ahmed v Daish [2025] EWHC 3056 (KB) Next Article Comments are only visible to subscribers.