The Paramount Duty Under Ikarian Reefer
Under Ikarian Reefer [1993] 2 Lloyd's Rep 68, expert witnesses owe a paramount duty to the tribunal to provide independent, objective evidence — regardless of who instructs or pays them. Country experts must not advocate for the instructing party. This duty is the defining quality of expert evidence in UK immigration tribunals.
Solicitors should assess independence before instruction: review previous reports for advocacy language, check whether the expert has only ever been instructed by claimant firms, and evaluate whether the expert's conclusions follow inexorably from assumed facts without independent verification.
CPR Part 35 and Practice Direction 2024
CPR Part 35 governs expert evidence and is applied by analogy in immigration tribunal proceedings. Practice Direction 2024 introduces mandatory report structure, a default 20-page limit, and strict exchange deadlines. Non-compliant expert evidence may be refused or given reduced weight.
Solicitors should ensure letters of instruction comply with PD 2024 requirements and that experts understand the mandatory report sections before commencing work.
Adam Pipe Guidance 2025
The October 2025 guidance by Adam Pipe reinforces that experts must distinguish assumed facts from independent analysis. Reports that read as advocacy — where conclusions follow inexorably from assumed facts without independent verification — damage credibility and may result in reduced tribunal weight.
Experts must state limitations clearly, cite dated primary sources, and avoid language that suggests they are advancing the client's case rather than assisting the tribunal.
Cross-Examination Readiness
Independence is tested under cross-examination. Solicitors should prepare experts by ensuring consistency between written and oral testimony, rehearsing methodology and source selection, and anticipating challenges on independence, dated sources, and assumed facts.
Experts must give honest answers even where they do not support the instructing party's case. Preparation that encourages experts to defend the client's position rather than assist the tribunal is a serious professional conduct risk.