When Expert Evidence Fails, the Consequences Are Serious
Courts rely on clear, impartial, and defensible expert testimony. Yet both solicitors and expert witnesses face recurring difficulties that place cases at risk.
Issues For Legal Teams
Unclear or unreliable expert reports
Too many reports conceal weaknesses, stray outside the expert’s remit, or lack the structure required for admissibility.
Late discovery of problems
Defects in the expert report come to light shortly before the hearing, with little time to correct them, putting the legal team on the back foot.
Time lost managing the expert
Solicitors are left to chase clarifications, address gaps, or coax explanations that should have been provided from the outset.
Professional exposure
A poorly prepared expert can draw judicial criticism, placing pressure on the solicitor responsible for instructing them.
Issues For Expert Witnesses
Uncertainty about standards and procedures
Many experts, including experienced professionals, are unclear about the standard expected of their reports and testimony.
Complexity in pricing and scoping
Expert instructions often involve document review, inspections, preparation time, and standby periods. Without clear structure, fees become guesswork.
Risk of stepping outside expertise
Experts sometimes accept instructions that stretch, or even exceed, the boundaries of their professional competence.
Concerns about independence and presentation
Public-facing material, reports, and even correspondence can unintentionally signal partiality, inviting an avoidable challenge.
When Expert Evidence Goes Wrong
Common errors make cases harder than they need to be. Mark helps ensure the evidence is presented clearly from the initial report, reducing the likelihood of avoidable courtroom disputes.
Eliminate Unclear Evidence
Prepare Effectively
Prevent Missteps
After examining hundreds of cases from around the world with the eyes of an experienced barrister, Mark knows where expert evidence breaks down and how to prevent avoidable failures.
As a practising barrister for over twenty years, Mark’s work is grounded in courtroom experience rather than theory. His book, The Reliable Expert Witness, is valued by professionals from around the world for their work in courts and arbitrations. As a keynote speaker and trainer, he has addressed groups internationally, helping experts and solicitors avoid unnecessary pitfalls.
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How to Work with Mark
What Successful Expert Evidence Looks Like
Clear, well-structured expert involvement makes the entire process more predictable.
Reports are properly prepared
Testimony is grounded in independence and clarity ​
Solicitors and expert witnesses avoid unnecessary strain
Clarity from the outset
Reports are structured, impartial, and easy for the court to follow.
Fewer late suprises
Weaknesses are identified early, not days before the hearing.
More efficient preparation
Experts understand their remit, and solicitors circumvent avoidable corrections and disputes.
Evidence the court can rely on
Testimony reflects independence, sound reasoning, and clear communication.
Clear Reports
Early Certainty
Strong Testimony
For those seeking deeper guidance from Mark
Explore Mark’s book and keynote presentations for practical advice on expert evidence.
Leading Resource for Experts
The Reliable Expert Witness
Mark Tottenham, an experienced barrister and mediator, and award-winning writer on legal issues, has written this short and authoritative guide to the responsibilities of professional witnesses. Drawing on authorities throughout the English-speaking world, he outlines: the duties of an expert witness; the requirements of a written court report; how to prepare to give evidence in court; how to maintain a professional detachment from the client and instructing legal team; the involvement of expert witnesses in preparing pleadings and ‘Scott schedules’; and the role of expert witnesses in other forums such as mediations, inquests, and public inquiries.
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About Mark Tottenham
Mark Tottenham is an author, speaker, and co-host of Ireland's top legal podcast The Fifth Court. He draws on 20+ years of practice as a barrister and analysis of hundreds of cases where unclear or poorly presented expert evidence created significant difficulty for the court, affected the fairness of proceedings, or placed the expert’s own credibility at risk.