‘The duty of candour is the pre-eminent procedural duty that governs the evidence base in judicial reviews. It requires all parties to assist the court with full and accurate explanations of all the facts relevant to the issue under review. The duty of candour is a common law duty. It has been helpfully summarised in several guides, including the Treasury Solicitor Guidance on Discharging the Duty of Candour and Disclosure in Judicial Review Proceedings (2010), which acts as practical guidance to government departments and lawyers, and the Administrative Court Judicial Review Guide 2022. What will be required of parties to meet their duty of candour is highly context sensitive. Public law litigants must, at each stage of proceedings, be aware of the information and documents which might be relevant. In many judicial reviews, say those that involve a challenge to an administrative decision made against an individual claimant, for which there is a clear and concise paper trail, compliance with the duty of candour will usually be straightforward. Candid disclosure is, however, a thornier task in complex judicial reviews, such as policy or systemic challenges, where there might be extensive and sensitive documents to potentially consider, sometimes stretching across multiple government departments.’

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Essex CAJI, 16th August 2023

Source: essexcaji.org