What Is an Expert Witness?
A Guide to Roles, Responsibilities, and Clinical Expertise in the UK Legal System
Summary
When legal disputes involve complex medical or social care issues, courts rely on specialist knowledge to reach a fair verdict. This guide explores the fundamental role of an expert witness, detailing their duty of absolute impartiality to the court. From drafting evidence-based reports to explaining the differences between Party Appointed (PAE), Single Joint (SJE), and Shadow Experts, discover how the Circle Case Management expert witness panel provides the authoritative, independent clinical opinions needed to resolve legal cases.
Expert Witness…an overview
The primary role of an expert witness is to offer an impartial, independent expert opinion based on the evidence or information at their disposal.
An expert witness is an individual with extensive experience and knowledge in a specific field or industry, with a much deeper understanding of that discipline than the average layperson.
Here at Circle Case Management, we have a hugely experienced panel of experts, available to provide witness reports covering a wide range of medical and social care issues.
Expert Witness…responsibilities
Fundamentally, expert witnesses are appointed by the courts to advise on issues outside the knowledge and experience of the courtroom but, crucially, are comfortably within the healthcare professional’s field of expertise.
The Expert Witness will present their expert opinion independently, based entirely on the information presented to them. This evidence will be contained within the Expert Witness Report which is available to both parties and the court itself. The report will be an honest and wholly impartial account of the expert’s opinion.
Why do we need an Expert Witness?
An expert witness is required when a court demands an evidence-based, specialist opinion to help resolve a dispute or case. Often the input of an expert witness can result in the early conclusion of a case, as the information provided can be irrefutably fact-based, rather than evidence motivated by one party’s desire for a favourable result.
Here at Circle Case Management, our Expert Witness Panel comprises a range of healthcare specialists who will always provide clinical and impartial opinions, based on many years of experience and expertise in their field.
What kind of Expert Witness is available?
The English and Welsh courts commonly use three different types of expert witness, which are as follows:
PAE – Party Appointed Expert: This expert witness will be requested by one party in a court dispute. They are called upon to assist on areas within their expertise by providing impartial, independent opinions. Importantly, their responsibilities supersedes that of the instructing party.
SJE – Single Joint Expert: This expert witness will be called upon by parties involved in the dispute. Again, their duty is to the court to assist on subjects within their field of expertise, and, again, their independent opinion is not influenced by the fee-paying party.
Shadow Expert – Expert Advisor: The advisor provides ongoing services to one party throughout the court proceedings. Unlike the SJE and PAE, they do not have a duty to the court and will rarely be required to provide evidence as they are not covered by the Civil Procedure
Why be an Expert Witness?
By becoming an expert witness, you are afforded the chance to share your knowledge and expertise to assist in often life-changing court cases. Importantly, by leaning on your professional opinion, there’s a greater chance that the courts will arrive at a reasonable, well-informed verdict. In that sense, it can be a hugely rewarding vocation, as these cases often have significant effects on an individual's well-being and long-term health.
How can we help?
If you’d like to speak to the team here at Circle Case Management to discuss the role of an expert witness, or to speak to one of our expert witness panel, please don’t hesitate to get in touch. We are here to help.
Posted by Nicola Kelly on July 21st 2026
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