// Expert Witness

Expert Witness Services

CPR Part 35-compliant expert witness evidence for criminal, civil, and regulatory proceedings. Experienced in courts across England and Wales.

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Expert Evidence That Holds Up

Digital evidence cases are increasingly common in commercial litigation, employment disputes, criminal proceedings, and regulatory investigations. The quality and credibility of expert evidence often determines outcomes.

Binary Response expert witnesses bring direct, current practitioner experience — not academics reviewing theoretical cases. Our experts are active incident responders who regularly handle the very technologies and scenarios they give evidence about.

Areas of Expertise

  • Digital forensics — evidence acquisition, analysis methodology, and findings in contested proceedings
  • Cybersecurity standard of care — whether an organisation's security posture met the standard expected for their size, sector, and risk profile
  • Incident causation — root cause analysis, contributory negligence, and attacker attribution
  • Data breach scope — what data was accessed, by whom, and what the likely consequences were
  • Ransomware and extortion — technical aspects of ransomware cases, including negotiation conduct and payment compliance
  • Insider threat — evidence of deliberate data exfiltration, unauthorised access, and IP theft
  • Fraud and financial crime — BEC, account takeover, and technology-facilitated fraud

Our Process

  1. Initial instruction review — we review the matter and confirm we can provide independent, useful opinion. We decline instructions where we cannot add value or where a conflict exists.
  2. Evidence review and analysis — forensic examination of materials provided; may include acquisition of additional evidence where required.
  3. Draft report — CPR Part 35-compliant expert report setting out our opinion, the basis for it, and the limits of our knowledge.
  4. Experts' discussion — where required, we engage with opposing experts to narrow issues.
  5. Oral evidence — examination in chief, cross-examination, and re-examination.

Standards and Compliance

All expert reports comply with Civil Procedure Rules Part 35 and the associated Practice Direction. Criminal proceedings reports comply with CrimPR Part 19. We are familiar with the Ikarian Reefer duties and the obligations of an expert to the court.

Frequently Asked Questions

Can you act as both investigator and expert witness in the same matter?

This requires careful consideration. Where we have conducted the original forensic investigation, we can give factual evidence about what we found. Giving opinion evidence on matters we investigated may create perception issues — we advise on this at instruction.

Do you provide joint expert services?

Yes. In cases where the parties agree to a single joint expert (SJE), we accept SJE instructions. We maintain strict independence and will not modify opinions in response to pressure from either party.

What jurisdictions do you cover?

Our primary experience is in England and Wales (civil, criminal, and regulatory proceedings). We have experience in Scottish proceedings and can advise on international matters, working with local counsel where required.

How quickly can you produce a report?

Timescales depend on the volume of evidence and complexity of the matter. We agree realistic timescales at instruction and adhere to them. Court-ordered deadlines are always met.

Can you advise before formal proceedings begin?

Yes — pre-litigation advisory opinions are common and often help parties understand the strength of their position before committing to proceedings. These are typically provided as letters of advice rather than formal expert reports.

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Frequently Asked Questions

What courts have your experts provided testimony in?

Our practitioners have provided expert evidence in the High Court, Crown Court, employment tribunals, regulatory proceedings, and international arbitration. We have experience with both written reports and oral testimony.

Do you provide expert reports for both prosecution and defence?

Yes. We provide impartial technical analysis regardless of instructing party. Our duty is to the court, and our reports reflect the technical evidence objectively.

What's your experience with cyber-related litigation?

We've provided expert evidence in cases involving data breaches, intellectual property theft, fraud, computer misuse, regulatory enforcement, contractual disputes involving technology failures, and employment disputes involving digital evidence.

How early should we engage an expert witness?

As early as possible. Early engagement ensures evidence is preserved correctly, forensic analysis is conducted to evidential standards, and the expert can advise on the strength of technical arguments before positions crystallise.