The skilled witness in Scotland: comparing the expert evidence requirements under Chapter 43

The status of the skilled witness in Scotland

Instructing solicitors operating across multiple jurisdictions must distinguish between the regulatory frameworks governing expert evidence in England and Wales and the distinct procedures applicable in Scotland. In the Court of Session and the sheriff court, the term ‘skilled witness’ is used to describe the expert. The admissibility and conduct of such evidence are governed by the rules of court, particularly the Chapter 43 procedure for personal injury actions, which operates independently of the England and Wales Civil Procedure Rules (CPR) Part 35.

In Scotland, the admissibility of expert evidence is guided by the principles established in Kennedy v Cordia (Services) LLP [2016]. The Supreme Court confirmed that a skilled witness must possess the necessary qualifications and experience to provide an opinion on matters outside the ordinary knowledge of the judge. Unlike the English regime, where Practice Direction 35 prescribes specific duties and formats, the Scottish approach relies on the court’s discretion to ensure evidence is relevant, reliable, and presented by an appropriately qualified professional.

When instructing a skilled witness, the focus remains on the specific question in issue, whether it concerns the standard of care, the mechanism of injury, or the nature of long-term prognosis. The skilled witness maintains a duty to provide independent, objective evidence to the court, a principle that is fundamental to the integrity of the litigation regardless of the instructing party.

Evidential base and the expert report

The report provided by a skilled witness in Scotland must be grounded in a comprehensive review of the relevant materials. This typically includes clinical records, imaging, and any available occupational history. Where primary evidence is incomplete or absent, the expert report should identify these limitations. An opinion expressed without sufficient evidential foundation may carry diminished weight, and the court will evaluate whether the expert has appropriately qualified their conclusions.

The report must address the core issue at the heart of the litigation, whether that is breach of duty or causation. In cases of clinical negligence, the standard of care is assessed based on the practice of a responsible body of medical opinion. While the principles of Bolam v Friern Hospital Management Committee [1957] and the subsequent qualification by Bolitho v City and Hackney Health Authority [1998] are persuasive in Scottish courts, practitioners should note that the court makes the final determination on whether a practice is logical and defensible.

Discipline boundaries and the handover of evidence

In complex litigation, a claim may require evidence from multiple medical disciplines, such as an orthopaedic surgeon and a neurologist. The orthopaedic expert addresses the surgical technique and the necessity of the intervention, while the neurologist addresses the pathophysiology of the resulting injury. It is critical that experts do not opine on the standard of care in a field where they do not hold expertise. The report should explicitly mark these professional boundaries to ensure the court is presented with the correct expert evidence on each distinct issue.

Procedural differences and expert interaction

The structured process of written questions under CPR Part 35.6 does not exist within the Scottish Chapter 43 procedure. In Scotland, the court exercises wide discretion to regulate evidence. The reconciliation of conflicting expert views often occurs through pre-trial meetings or the preparation of joint statements, where directed by the court. These processes serve to narrow the issues in dispute.

• Define the parameters of the inquiry clearly in the letter of instruction.
• Provide all relevant medical records and factual statements forming the basis of the claim.
• Ensure the expert distinguishes between conditions that are fixed and those subject to future change.
• Require the expert to state the degree of volatility in a prognosis to assist in the valuation of quantum.

The integrity of the expert’s role as a witness for the court, rather than the instructing party, is a standard expected across all UK jurisdictions. Any influence on the content of the expert’s report, or pressure to adopt a particular view, undermines independence and risks the admissibility of the evidence. Ultimately, the evidence must be sufficient to support the claim, while remaining subject to the court’s determination after considering the totality of the medical and factual evidence.