Instructing a Medical Expert Witness 2026. The Solicitor's Guide to Evidence That Survives Challenge
The medical expert you instruct decides most civil claims long before anyone reaches a courtroom, and the reports that fail do so for predictable reasons. They assert where they should measure, they answer the diagnosis rather than the question posed, and they arrive from an expert whose independence collapses under the first line of cross-examination. The Wellness Medico-Legal Wing produces CPR Part 35 compliant reports from our Marylebone clinic adjacent to Harley Street, from £1,950 plus VAT for a single-injury condition and prognosis report and £4,950 for clinical negligence breach of duty and causation, with objective investigation performed in the same visit as the examination. This guide sets out what a letter of instruction should contain, what separates evidence that holds from evidence that does not, what the market charges, and the traps that cost firms cases and costs orders. Instructions are accepted nationally from claimant firms, defendant firms and insurers.
Reviewed by the medical team at The Wellness. Last updated July 2026.
Discuss an instruction on WhatsApp or email team@thewellnesslondon.com or call 020 3951 3429.
What CPR Part 35 actually requires of an expert
Part 35 is short and its central provision is the one experts most often forget in practice. An expert's duty is to help the court on matters within their expertise, and that duty overrides any obligation to the person instructing or paying them. Practice Direction 35 then sets out what the report must contain, including the expert's qualifications, the substance of all material instructions, the range of opinion where there is one and the reasons for the expert's own view, a statement that they understand and have complied with their duty to the court, and a statement of truth. Reports missing these elements get attacked, and rightly. Two practical consequences follow for instructing firms. First, an expert who has never acted for the other side is easy to characterise as partisan, so a genuinely mixed practice is a credential rather than a detail. Second, an expert whose fee depends in any way on the outcome has forfeited the independence Part 35 assumes, which is why conditional and contingency arrangements have no place in expert work. Deferred payment on conclusion of the claim is an entirely different thing and is standard practice.
What a letter of instruction should contain
Weak instructions produce weak reports and the expert usually gets the blame. A letter that produces a usable report contains the following.
The precise questions on which opinion is sought, numbered, and framed as questions rather than as an invitation to comment generally.
The claimant's details, the index event and date, and the case reference.
A complete and paginated records bundle, with a chronology where the records are voluminous.
Any policy wording, contract of employment or job description where capability or contractual definition is in issue, which is essential in income protection and employment matters.
The relevant protocol or procedural context, the stage the claim has reached and the deadline.
Any previous medical evidence, including the other side's, where a commentary is sought.
Confirmation of who is paying and on what terms, and whether the instruction is single joint expert.
Firms that send instructions of this quality get reports in ten working days. Firms that send a name and a date get correspondence.
What separates evidence that holds from evidence that fails
Four things, in the order they matter. Measurement over assertion is first. An opinion that the claimant has ongoing shoulder impingement is challenged easily. The same opinion supported by ultrasound performed at the examination, documenting the tendon, is challenged with difficulty. Second, answering the question asked. A report that discusses the diagnosis at length and never states whether the claimant can perform the material duties of their occupation has answered nothing that matters. Third, engaging with the range of opinion. Part 35 requires it, and an expert who acknowledges the contrary view and explains why they reject it is far harder to dislodge than one who pretends no contrary view exists. Fourth, internal consistency between the history, the records, the examination and the conclusion. Most successful cross-examination of medical experts is not clever. It simply reads the report back to them.
Ask about a specific case on WhatsApp or email team@thewellnesslondon.com.
Where objective investigation changes the outcome
The structural weakness in most medico-legal reporting is that the expert examines and takes a history but cannot investigate. Anything requiring imaging or laboratory analysis becomes a separate referral, a further delay and a further fee, so in practice it frequently does not happen and the opinion rests on the examinee's account. At The Wellness that gap closes, because the examining doctor performs diagnostic ultrasound and takes venous bloods for accredited laboratory analysis on the day of the examination. In musculoskeletal and soft tissue claims that means the injured structure is imaged rather than described. In fatigue, pain and capability claims it means ferritin, thyroid function, inflammatory markers and vitamin status are measured, which either identifies a missed and treatable contributor or forecloses the argument that the claimant was never properly investigated. In clinical negligence it means the current clinical position is documented objectively rather than inferred from records. Firms instructing on cases where causation or credibility is contested should ask any prospective expert one question, which is what they can measure on the day and what they would have to refer out.
What should a medical expert report cost
The UK market splits sharply and the bottom of it is set by regulation, not by quality. In low value soft tissue road traffic claims the first report must be sourced through the MedCo portal at a statutory fee of £180, with experts allocated at random from a list of seven, so selection on merit is not available in that tier at all. Above it, standard agency reports commonly start around £450 plus VAT. Consultant-authored personal injury reports typically run from £1,200 to £2,400 plus VAT for a single body part and £1,600 to £4,200 plus VAT for multiple, clinical negligence opinions commonly exceed £1,500 plus VAT and rise well beyond it, hourly rates run from £250 to £450 plus VAT with senior experts above £500, and court attendance is charged at £1,000 to £3,000 per day across the market. Cancellation and non-attendance fees of £400 to £800 plus VAT are standard, as are terms charging 50 percent for cancellation inside twelve working days.
The Wellness Medico-Legal Wing prices at the senior consultant tier because investigation is included rather than referred out. All figures are plus VAT and are from prices.
Clinical negligence breach of duty and causation opinion from £4,950.
Court, tribunal or ombudsman attendance from £3,500 per day and £2,250 per half day.
Complex or multi-injury condition and prognosis report from £3,450.
Single-injury condition and prognosis report with examination from £1,950.
Joint statement and expert discussion from £1,450, commentary on opposing evidence from £1,450.
Screening or merits opinion on records from £750, Part 35 questions from £650.
Hourly rate for conferences with counsel, addenda and further work from £450.
Same-visit diagnostic ultrasound from £995 per region and comprehensive blood analysis from £495.
Deferred payment terms are available to instructing solicitors, and fees are never conditional on outcome.
Six traps worth avoiding
Each of these costs firms cases, costs orders or both.
Instructing the claimant's treating clinician as the expert. Treating and expert roles conflict, and the resulting evidence is vulnerable on independence.
Sending an incomplete records bundle and then querying the timescale, which is the single most common cause of delay in medico-legal reporting.
Asking for comment generally instead of posing numbered questions, which produces a report that answers nothing precisely.
Omitting the policy wording or job description in capability and income protection matters, so the expert addresses fitness for work in the abstract rather than the contractual test.
Accepting an expert who cannot investigate on the day in a case where credibility or causation is contested.
Treating the fee as the variable to minimise. The evidence usually determines the value of the claim, which makes it the highest-return line in the file.
Why instruct The Wellness Medico-Legal Wing
Investigation happens in the same visit, so opinion rests on measurement. Reports are prepared to Part 35 and Practice Direction 35 form, with the declaration and statement of truth in place. Turnaround is ten working days as standard and five on expedited terms, against a market where four to six week waits for an examination appointment are routine before the report is even started. Instructions are taken from claimant firms, defendant firms and insurers alike, so the independence declaration means something. And examinations take place at a Marylebone address three minutes from Baker Street, with domiciliary visits where injury severity requires them and interpreter and chaperone arrangements on request.
Request our terms of business and fee schedule on WhatsApp or call 020 3951 3429.
Frequently asked questions
How do I instruct a medical expert witness
Send a letter of instruction with numbered questions, the case reference, the index event, a complete paginated records bundle, any relevant policy wording or job description, and the deadline. The Wellness Medico-Legal Wing returns a fee quotation and a confirmed examination date within one working day.
What makes a medico-legal report defensible under cross-examination
Objective findings rather than assertion, direct answers to the questions posed, engagement with the range of opinion as Part 35 requires, and internal consistency between history, records, examination and conclusion. Reports that fail usually fail on the first two.
Can an expert be paid on a no win no fee basis
No, and no firm should ask. Courts expect expert independence to be beyond argument, so a fee contingent on outcome undermines the evidence it pays for. Deferred payment on conclusion of the claim is different, is entirely proper and is available to instructing solicitors.
Why can I not choose my expert in a whiplash claim
Because in low value soft tissue road traffic claims the first report must be sourced through the MedCo portal at a statutory fee of £180, with a randomly generated list of seven experts. Selection on merit is only available above that tier.
Can the claimant's own doctor write the expert report
It is generally unwise. The treating role and the expert role conflict, and evidence from a treating clinician is straightforward to challenge on independence. Instructing a separate expert protects the evidence.
How long does a medico-legal report take
Ten working days from examination and complete records at The Wellness Medico-Legal Wing, or five on expedited terms at a surcharge. Delays across the market are usually caused by incomplete records bundles rather than by the expert.
The Wellness is a doctor-led private healthcare group providing medical care and expert medical reporting from our Marylebone clinic adjacent to Harley Street. All doctors are GMC-registered. Experts instructed through the Medico-Legal Wing owe an overriding duty to the court under CPR Part 35, which takes precedence over any obligation to the instructing party. This article is general information and not legal advice.
Enquire now on WhatsApp or email team@thewellnesslondon.com or call 020 3951 3429.
References. Civil Procedure Rules, Part 35 and Practice Direction 35, experts and assessors. Guidance for the Instruction of Experts in Civil Claims, 2014. Pre-Action Protocol for Low Value Personal Injury Claims in Road Traffic Accidents, fixed cost medical report provisions. MedCo Registration Solutions, accreditation and portal rules, 2026. British Medical Association, medico-legal fees guidance, 2026. Published 2026 UK medico-legal fee schedules from practising expert witnesses and medical reporting organisations.
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