Professional indemnity insurance for expert witnesses and medico-legal report writers.
Expert Witness and Medico-Legal Professional Indemnity Insurance
Acting as an expert witness used to carry an unusual privilege: near-total immunity from being sued over the evidence you gave. That protection is gone. Since the Supreme Court's decision in Jones v Kaney (2011), an expert who prepares a report or gives evidence in proceedings can be sued in negligence by the party who instructed them. For anyone who writes reports for the courts, tribunals or solicitors — whether a clinician doing medico-legal work, an engineer, an accountant or a surveyor — professional indemnity (PI) insurance stopped being optional and became the thing standing between a disputed opinion and your personal assets.
This is a national guide. Apex is based in Bristol and works closely with clients across the South West of England and South Wales, but expert-witness and medico-legal PI is a specialist line we place UK-wide. Below we set out what changed, where the exposure actually sits, and how cover should be structured so that a complaint about a report does not become a claim you have to fund yourself.
What Jones v Kaney changed, and why it matters to you
Before 2011 the courts treated expert witnesses as effectively immune from suit in respect of their evidence, on the basis that an expert should be free to give honest opinions without fear of being sued by a disappointed client. Jones v Kaney removed that shield. The reasoning was straightforward: other professionals carry a duty of care to their clients and answer for negligence, and there was no principled reason to exempt experts. The result is that an expert now owes the instructing party a duty in contract and in tort, and can be held liable if a report or oral evidence falls below the standard of a reasonably competent expert in the field.
Importantly, your overriding duty remains to the court, not to whoever pays your fee. That tension is exactly where liability lives. You are not liable for giving an honest opinion the court dislikes. You are potentially liable where the work is done negligently — a missed record, a methodology that does not stand up, a report that overreaches your area of competence, or evidence that collapses under cross-examination in a way a careful expert would have avoided.
Where the exposure sits for report writers
Claims against experts rarely turn on the headline opinion alone. In practice the risk concentrates in a handful of recurring areas:
- Scope creep beyond competence. Giving an opinion on a matter outside your genuine expertise is one of the fastest routes to criticism and to a claim.
- Records and factual foundation. An opinion built on an incomplete review of medical records, disclosure or site evidence is vulnerable if a material document was available and overlooked.
- CPR Part 35 and duties to the court. Failure to comply with the rules governing experts — declarations, the duty of independence, disclosure of the substance of instructions — can undermine a report and expose the expert to costs consequences and criticism.
- Late or defective reports that cause a party to lose a hearing, miss a deadline or incur wasted costs.
- Breach of confidentiality or data protection when handling sensitive personal and medical information.
- Wasted costs orders and criticism in judgment, which can trigger both a reputational and a financial response even where a formal negligence claim never lands.
Because much of this activity is defensible only with the right specialist support, the value of good cover is as much about the defence and advocacy as the eventual indemnity.
Medical practitioners doing medico-legal work
Doctors and other clinicians are a large part of the expert-witness world, and their position needs particular care. Medico-legal report writing usually falls outside the scope of clinical negligence cover and NHS indemnity, and it may not be covered by a medical defence organisation's discretionary arrangement in the way clinical practice is. In other words, the indemnity that protects you when you treat a patient may do nothing when you write a report about someone else's patient.
If you split your week between clinical practice and medico-legal instructions, you need to be certain that both activities are covered, and by what. We frequently see clinicians who assume their defence body or employer cover extends to report writing when it does not. The safe approach is a clear, contract-certain PI policy that names medico-legal and expert-witness work as an insured activity. Clinicians combining consulting and medico-legal income should also read our guide to professional indemnity insurance for medical practitioners, which covers the wider private-practice picture.
How expert-witness PI cover should be structured
Expert-witness and medico-legal PI is written on a claims-made basis, which has real consequences for how you buy and keep it:
- Named activities. The policy should expressly include expert-witness work, court and tribunal attendance, and medico-legal report writing — not a generic professional description that an insurer could later argue does not capture it.
- An appropriate limit of indemnity. The right limit depends on the value of the matters you opine on, not your fee income. An expert in high-value clinical, construction or commercial disputes needs a limit that reflects the sums in issue in those cases.
- Retroactive cover. Because claims can surface years after a report, continuous cover back to when you started this work matters. A gap in the retroactive date can leave old reports uninsured.
- Run-off cover. When you retire or stop taking instructions, the long tail of potential claims does not stop. Run-off cover keeps you protected for reports written before you closed.
- Defence costs and disciplinary support. Cover should respond to the cost of defending a claim and, ideally, to representation at inquests, regulatory or disciplinary proceedings connected to your expert work.
Getting these features right is a placement job, not a tick-box exercise, which is where a specialist broker earns their keep.
Why work with Apex
Apex is directly authorised and regulated by the FCA (FRN 724952) and holds its own permissions. We run a named-broker model: you deal with a director-level broker who knows your file, handles the placement, argues your corner at claims stage and manages renewal — not a call centre. We have access to more than 30 qualifying and professional-lines insurer markets, which matters for a niche class where the wrong insurer either declines the risk or writes it too narrowly. Around 95% of our clients stay with us, and we already publish specialist placement guidance for difficult and non-standard professional risks.
Expert witnesses sit alongside the wider professions we look after, from solicitors and accountants to surveyors and engineers — many of whom take expert instructions themselves. You can also see the full range of professions we cover on our sectors page.
Frequently asked questions
Do I really need PI insurance to act as an expert witness?
Since Jones v Kaney (2011) an expert can be sued in negligence by the party that instructed them, so the practical answer is yes. Some solicitors and agencies will not accept instructions from an uninsured expert, and without cover any claim — and its defence costs — falls on you personally.
My clinical work is covered by a medical defence body. Isn't my report writing covered too?
Usually not. Clinical indemnity and NHS arrangements typically cover treatment of patients, not medico-legal report writing about a claimant you are not treating. Medico-legal and expert work generally needs its own PI policy that names that activity. Always check the exact scope rather than assume.
How much cover do I need?
The limit should reflect the value of the disputes you opine on, not just your fee income. An expert working on high-value clinical or construction cases needs a materially higher limit than one giving evidence in low-value matters. We help you size this against the cases you actually take.
What happens to my cover when I stop taking instructions?
Expert-witness PI is claims-made, so a claim about an old report is only covered if a policy is in force when the claim is made. Run-off cover keeps you protected after you retire or stop, for reports written while you were practising. We build this into the renewal conversation well before you wind down.
Will the policy help if I face criticism in a judgment or a wasted costs application?
A well-structured policy responds to the cost of defending negligence claims and can extend to representation where an expert faces criticism, wasted costs applications or connected regulatory proceedings. The exact response depends on wording, which is precisely what we check at placement.
I do expert work alongside my main profession. Can it be covered under one policy?
Often yes. Where you already hold PI for your main practice, expert-witness activity can sometimes be added as a named activity, or placed separately where the risk profile differs. The right structure depends on your split of work and the limits each side needs.
Get a quote / Speak to a broker
Tell us about your expert-witness or medico-legal work and we will structure cover that names the activity, sets the right limit and protects you across the long claims tail. Start with a quote request, or contact the team to speak to a named, director-level broker. If you combine expert work with a wider practice, ask us about a commercial quote that brings it together.