CPIA disclosure: investigation, defence engagement and continuing review

The purpose and the vocabulary

CPIA disclosureGlossary termCPIA disclosure helps ensure that the defence receives prosecution material capable of undermining the prosecution or assisting the defence. It is not an automatic right to inspect every investigation file. Equally, it is not confined to material that proves innocence. The investigator must conduct proper enquiries and preserve material; the disclosure officer brings relevant unused material and potential disclosure to the prosecutor’s attention; the prosecutor applies the legal test and keeps it under review. The court resolves contested disclosure and public-interest protection through the appropriate powers. CPIA sections 3 and 7A; 2020 Code, paragraphs 2–7; CrimPR Part 15.

Material includes information, documents, recordings, data and objects. Relevant material may have a bearing on an offence or person under investigation or on the surrounding circumstances, unless incapable of having an impact. Used material is what the prosecution relies on as evidence. Unused materialGlossary termUnused material is relevant retained investigation material not being relied on as prosecution evidence. “Unused” does not mean unimportant, and it does not mean automatically disclosable. A witness’s earlier inconsistent account, an unsuccessful forensic result or a record pointing to another suspect may be crucial despite not forming part of the prosecution’s chosen case. CPIA section 2; 2020 Code, paragraphs 2.1, 5–7.

Sensitive materialGlossary termSensitive material is material whose disclosure would give rise to a real risk of serious prejudice to an important public interest. Examples can include protection of a source or a continuing operation, depending on the facts. Mere embarrassment, an inconvenient inconsistency or a preference for secrecy is not enough. Sensitivity controls handling and possible protective procedure; it does not remove the material from the disclosure assessment. Private personal data and sensitive public-interest material are not interchangeable categories. 2020 Code, paragraphs 2.1 and 6.12–6.16; CrimPR 15.3.

Investigation comes first: pursue, record, retain and reveal

An investigator must pursue all reasonable lines of enquiry, whether pointing towards or away from the suspect. Reasonableness depends on the facts and available information. An enquiry is not reasonable merely because someone can imagine a remote possibility; nor is it dispensable because it may weaken the prosecution. Record important information and enquiry results in a durable form, including relevant negative results. Retain relevant material in accordance with the Code rather than discarding it because the investigator does not expect to use it. 2020 Code, paragraphs 3.5, 4 and 5.

Retention means keeping material; revelation means drawing it to the prosecutor’s attention; disclosure means providing it or appropriate access to the defence under the legal test. The first two duties must operate properly for the third to work. The prosecutor cannot make a sound decision about an unrecorded inconsistency or a concealed item. Retention continues through the proceedings, and the Code has further requirements following conviction, sentence, appeal and relevant Criminal Cases Review Commission activity. Do not destroy relevant material simply because initial disclosure has been served. 2020 Code, paragraphs 5–7.

A schedule is a structured inventory of unused material. Where the Code requires a schedule, retained material that may be relevant and is not expected to form part of the prosecution case must be listed on the appropriate schedule. That scheduling duty is not restricted to material that meets the narrower disclosure test. The non-sensitive schedule should describe items sufficiently to allow an informed decision, with useful identifiers rather than entries such as “miscellaneous papers”. Sensitive items are dealt with separately, with reasons for sensitivity and the required access for the prosecutor. Highly sensitive material may need exceptional arrangements, but that is not permission to omit it from prosecutorial consideration. A schedule records the existence and character of material; it is not itself the underlying material or an automatic order to disclose every item. 2020 Code, paragraphs 6.2–6.7 and 7; CPIA sections 3 and 7A.

The usual scheduling arrangements depend on the proceedings and anticipated plea. For a summary or either-way charge where a guilty plea is anticipated, Code paragraph 6.4 dispenses with a schedule unless a not-guilty plea is subsequently entered or indicated. However, that procedural distinction does not authorise suppression of material that should be disclosed to protect fairness before plea, bail or other early decisions. The Code’s investigation duties begin before the statutory trial-disclosure stage, and common-law obligations can require earlier disclosure. CPIA section 1; 2020 Code, paragraphs 6.3–6.5; 2024 Attorney General’s Guidelines, paragraphs 78–88 and 102–107.

Third-party and digital material: focused enquiry, not indiscriminate trawling

A third party is a person or body outside the prosecution investigation holding potentially relevant material, such as a transport operator, employer or medical provider. If there is reason to think a third party holds material relevant to a reasonable enquiry, the investigator should take appropriate steps to identify and preserve it, seek it through a lawful route and tell the prosecutor about the position. A prosecutor cannot automatically hand over a file never obtained or inspected. Equally, the prosecution cannot avoid a reasonable enquiry by declaring that the information belongs to someone else. 2020 Code, paragraph 3.6; 2024 Attorney General’s Guidelines, paragraphs 10–18.

Digital material often needs a defined source, date range, participants and search method. “All data on every device” may be unjustified; “the messages between these two accounts during the alleged arrangement, including deleted material where lawfully recoverable” may identify a reasonable enquiry. Explain why the method is capable of finding undermining or assisting material, record its limits, and reconsider it if new issues show that the first scope was too narrow. Volume does not switch off disclosure, and a search term is not a substitute for considering context and the cumulative effect of material. 2024 Attorney General’s Guidelines, paragraphs 10–18, 61–88 and Annex A.

Victim information requests have additional safeguards in force from 12 January 2026. For requests within Chapter 3A of the Police, Crime, Sentencing and Courts Act 2022, sections 44A–44F, an authorised person must consider whether third-party information about a victim is relevant to a reasonable line of enquiry and whether the request is necessary and proportionate. The Victim Information Requests Code of Practice explains the written information to be given to the victim and third party and the limited exceptions. The victim should ordinarily be informed before or when the request is made, or as soon as practicable where prior notification is not practicable; statutory exceptions include risks to an investigation or serious harm. The decision and reasons must be recorded. This is not a blanket rule permitting all records whenever the complainant’s credibility is disputed.

Counselling information receives a higher threshold. Start with the statutory presumption that requesting it is not necessary and proportionate. The decision requires compelling justification to rebut that presumption and the additional requirement that the information is likely to have substantial probative value to a reasonable line of enquiry: real evidential value, not mere possible relevance. Consider less intrusive sources and the impact on the victim. Section 44A; Victim Information Requests Code, especially paragraphs 83–90. The safeguard is not an absolute immunity for counselling records. It governs obtaining information; the CPIA disclosure test and the rules on admitting evidence are later, separate questions.

Initial disclosure: apply the actual statutory test

Under CPIA section 3(1), the prosecutor must disclose previously undisclosed prosecution material that might reasonably be considered capable of undermining the prosecution case or assisting the case for the accused, or state in writing that there is no such material. This is an objective capacity test. Material need not be decisive, establish an alibi conclusively, or be part of the prosecution’s intended evidence. Consider it in its context and with other material. A small inconsistency may matter more when combined with a timing problem or a second account. Section 3; 2024 Attorney General’s Guidelines, paragraphs 61–88.

The statutory regime applies to the relevant summary not-guilty and Crown Court proceedings identified in CPIA section 1. Do not infer from that starting point that useful exculpatory material may be held back before the regime applies. Early fairness obligations and reasonable investigation continue to matter. Initial disclosure should be made within the proper preparation timetable; an unexplained wait for a defence statement wrongly reverses the sequence. For anticipated not-guilty summary proceedings, the pre-first-hearing expectation applies where the charge was brought under the Full Code Test. If a guilty plea was expected but a not-guilty plea is entered, initial disclosure should follow as soon as possible. Where charging relied on the Threshold Test, provide initial disclosure as soon as possible after the Full Code Test has been applied, complying with any court-ordered timetable. The Crown Court approach is to achieve it before the PTPH where possible, with a reasoned plan for justified outstanding work. 2024 Guidelines, paragraphs 102–107; CrimPR 15.2.

The disclosure plan must expose the actual work

A Disclosure Management Document, or DMDGlossary termDisclosure management document (DMD), explains the prosecution’s disclosure approach, including the enquiries made or proposed, treatment of digital and third-party material, search parameters, decisions about material and outstanding work. It is a means of informed engagement, not a substitute for schedules, disclosure or the prosecutor’s legal decision. CrimPR 15.2; 2024 Attorney General’s Guidelines, paragraphs 95–101.

The Guidelines say a DMD should be used in all Crown Court cases. In summary and youth proceedings its use should be considered where complexity or another feature makes it helpful. Serve it with initial disclosure and keep it accurate as matters develop. A large or phased exercise needs defined stages, reasons and a realistic completion plan. The defence should identify a specific deficiency rather than merely complain about volume. The court can then assess what remains necessary and how the case can fairly progress. “There are many files” is a reason to plan, not an answer to a focused disclosure issue.

Defence statements: required content, not privileged advice

A defence statementGlossary termDefence statement is the formal written statement of the defence case under the CPIA. In the Crown Court it is compulsory when section 5 applies. In an ordinary sent case this requires the relevant prosecution evidence and sending notice as well as the prosecutor’s compliance or purported compliance with initial disclosure. In a magistrates’ court it is voluntary under section 6. Both routes require service on the court and prosecutor when a statement is given. A case-management form is not automatically a compliant statutory defence statement. CPIA sections 5–6; CrimPR 15.4.

Under section 6A, the statement must set out the nature of the defence, including any particular defence relied on; identify disputed prosecution facts and explain why they are disputed; give particulars of the facts the defendant intends to rely on; and identify legal points, including admissibility or abuse, with the authorities relied on. For an alibi, meaning evidence of being elsewhere at the relevant time so as not to be, or not likely to be, at the offence location, it must give each alibi witness’s name, address and date of birth where known, together with any available information materially helping identification or location where those details are not known. A bare “not guilty; prosecution put to proof” statement is not enough where it omits those required matters.

A compliant statement identifies the case to be met and helps the prosecutor reassess material. It does not transfer the prosecution’s burden or require disclosure of privileged legal advice and every confidential instruction. Obtain accurate instructions and the defendant’s authority; do not invent a positive account to fill a form. If the defence changes materially, engage promptly, make the true position clear and obey lawful directions. Late departure can attract the consequences discussed below, so a lawyer should not preserve a knowingly obsolete account until trial.

Commencement trap. section 6B’s separate statutory updated-statement regime and section 6D’s notification of every expert instructed remain prospective. Do not teach them as operative duties merely because their text appears in a consolidated Act. Current case-management duties, expert-evidence rules, disclosure consequences and the operative witness-notice updating duty still apply. In particular, notice of an expert actually intended as a trial witness is a different matter from a supposed duty to name every privately consulted expert. CPIA sections 6B and 6D commencement annotations; sections 6A, 6C and 11; CrimPR Parts 3 and 19.

Defence witness notices are separate and apply in both courts

Under CPIA section 6C, the defendant must notify the court and prosecutor whether any person other than the defendant is intended as a trial witness. Give the names, addresses and dates of birth known and any available information materially assisting identification or location where details are missing. Alibi-witness information already supplied under section 6A need not be duplicated. If a witness is added, removed or further identifying details become known, give an appropriately amended notice. The duty operates in both summary and Crown Court proceedings; it does not become voluntary because a summary defence statement is voluntary. Section 6C; CrimPR 15.4.

This is a witness notice, not a general obligation to hand over all defence witness statements or counsel’s preparation notes. An intended expert witness also engages the separate service rules for expert evidence. Keep the identity notice, expert-report service, statutory defence statement and informal case-management communication distinct.

Calculate the defence period from the right trigger

The Criminal Procedure and Investigations Act 1996 (Defence Disclosure Time Limits) Regulations 2011, SI 2011/209, regulation 2, prescribe 14 days for summary proceedings and 28 days for Crown Court proceedings. The period begins with the day on which the prosecutor complies or purports to comply with section 3. Count that day as day one. These are calendar-day periods, not 14 or 28 business days. If the final day is Saturday, Sunday, Christmas Day, Good Friday or an England and Wales bank holiday, it rolls to the next day that is none of those.

In an ordinary case where the relevant prosecution evidence and notice have already been served, if initial disclosure is given on Tuesday 1 September 2026, day 14 is Monday 14 September and day 28 is Monday 28 September. If initial disclosure is given on Sunday 6 September, day 14 is Saturday 19 September, so the summary period ends on Monday 21 September, assuming no relevant bank holiday. These are worked calendar examples, not a claim that future legal developments have been checked. Do not count from the following day, the PTPH, a later reminder or counsel’s receipt of instructions.

The reference to purported compliance matters. A defence objection that initial disclosure is deficient does not safely entitle the defendant to ignore a purported section 3 response and assume that time has not started. Identify the actual statutory service conditions, challenge the deficiency, explain what prevents a proper statement and apply for an extension within time. Where the evidence or notice condition in section 5(3A) is disputed, put that issue before the court rather than silently choosing a new clock.

Under regulation 3, an extension application must be made within the existing period. Identify why compliance within it would be unreasonable and the extra time needed. The court may extend, and further timely applications are possible. It is the application, not necessarily the eventual decision, that must be within the period. A general power to extend a case-management date after expiry does not remove this specific requirement. A timely, reasoned application is safer than informal agreement with the prosecutor or a request after expiry. SI 2011/209, regulations 2–3; CrimPR 15.4 and 15.9.

Continuing review: one test applied to a developing case

Under CPIA section 7A, after initial compliance or purported compliance the prosecutor must keep undisclosed material under review until acquittal, conviction or a decision not to proceed. The test remains whether material might reasonably be considered capable of undermining the prosecution or assisting the defence. The defence statement is a particularly important trigger for reassessment, but it is not the only one. A changed witness account, new evidence, a narrowed issue or material emerging during trial can change the significance of an existing item. Disclose newly qualifying material as soon as reasonably practicable within the applicable procedure; a completed initial exercise does not end the duty.

Do not teach the repealed section 7 “secondary disclosure” as a separate, narrower current test. Section 7A’s continuing review is the current mechanism. Consider combinations of items, not merely each in isolation. A schedule entry that appeared peripheral before an alibi or identification issue became clear may now require investigation and disclosure. If no further disclosure is required following the defence statement, communicate the reasoned statutory position rather than letting silence imply that the statement was ignored. CPIA section 7A; CrimPR 15.2; 2024 Guidelines, paragraphs 124–129.

Section 8: a focused court application after defence disclosure

A section 8 disclosure applicationGlossary termSection 8 disclosure application is the defendant’s route to a court order for prosecution material which should have been disclosed. CPIA section 8(1) requires that a defence statement has been given and that the prosecutor has complied, purported to comply or failed to comply with the continuing-disclosure response under section 7A(5). Under 8(2), the defendant needs reasonable cause to believe that there is prosecution material required to be disclosed under section 7A which has not been disclosed. A summary defendant who chose not to give a defence statement cannot use section 8 merely by calling an ordinary request an application. The prosecution’s own disclosure duty nevertheless continues.

First make the issue intelligible to the prosecutor: identify the material or sufficiently defined class, connect it to the live defence and ask for a reasoned response. If unresolved, apply in writing under CrimPR 15.5, serve the court officer and prosecutor, describe the material, explain the reasonable belief that the prosecutor has it and that it meets the test, and say whether a hearing is requested and why. A schedule, a witness’s reference to a recording or a known investigation step may supply the factual basis; a speculative wish that useful material might exist does not by itself do so.

The court must not order disclosure unless the prosecutor is present or has had at least ten business days to make representations. These are alternatives: the rule does not impose an unavoidable ten-business-day wait where the prosecutor is present. Nor does an urgent defence request remove the prosecutor’s safeguard. The court then determines the statutory issue, including any proper public-interest protection. A section 8 application cannot compel a speculative search of all third-party files as though they were already prosecution material. CPIA section 8; CrimPR 15.5.

PII: protect a public interest without sacrificing a fair trial

Public-interest immunity, or PIIGlossary termPublic interest immunity (PII), concerns material otherwise meeting the disclosure test where public-interest protection is sought. The prosecutor does not finally decide to withhold it merely by labelling it sensitive. Apply the test first, identify the actual risk, consider whether a proper admission, agreed fact, redaction, extract or gist can protect the interest while giving the defence what fairness requires, and seek a judicial ruling where protection still requires withholding. CPIA sections 3(6), 7A(8) and 8(5); CrimPR 15.3.

A redaction removes protected details; an extract supplies a relevant part; a gist communicates the substance without every protected detail. None is adequate merely because it is easier for the prosecution. It must preserve what the defence needs to understand and use the point. If removing the source’s name also removes the only practical way to investigate the alternative suspect, the court must confront that consequence rather than assume anonymisation solves the problem. R v H and CKey caseR v H and C[2004] UKHL 3 [2004] UKHL 3, paragraphs 18 and 36.

The prosecutor’s application must describe the material, explain why withholding is justified and identify the appropriate protective procedure. Under CrimPR 15.3, the hearing is ordinarily private unless the court directs otherwise; the defendant is excluded only to the extent the court directs. This is not the same default as rule 3.11. The court should preserve as much effective defence participation as possible without defeating the necessary protection. Protected documents and representations are handled as the rule and court direct. A PII decision remains reviewable as the issues develop under 15.6 and the continuing duty.

Rule 3.11: informing the court where the prosecutor thinks the CPIA obligation does not apply

CrimPR 3.11 applies where the prosecutor has or knows of material whose revelation is thought to create a real risk of serious prejudice to an important public interest; the prosecutor does not think the CPIA Part I obligation to disclose applies; but the prosecutor considers the court must know of its existence to avoid potential unfairness to the defendant, prejudice to fair trial management or prejudice to that public interest. All parts of the trigger matter. This is a prosecutor-specific mechanism, not a general application any party can use for private information.

The prosecutor must ask for a hearing. The defendant is notified of the request only to the extent and at the time directed by the court. The prosecutor explains why the hearing and the defendant’s absence are necessary, what the defendant should be told and when, and provides or describes the material only so far as necessary and in the manner directed. Unless the court directs otherwise, the hearing is private and in the defendant’s absence, with restricted notifications and protected handling of material. CrimPR 3.11(2)–(4). It is inaccurate either to require an ordinary public application or to tell the prosecutor to remain silent because the CPIA test is thought not to apply.

Rule 3.11 is not a substitute PII order for material the prosecutor accepts must otherwise be disclosed. If the disclosure assessment changes, the proper CPIA and Part 15 process must be followed. Nor does invoking 3.11 make the prosecutor’s view immune from judicial scrutiny or displace the overriding requirement of fairness.

Faults and later use: know the limits of the consequence

Under CPIA section 11, failure to give a compulsory defence statement, lateness, inconsistency or reliance on a different or omitted defence matter can permit appropriate comment and proper inferences. In summary proceedings, merely choosing not to give the voluntary statement is not that default; once one is given, defects and late departures can engage the statute. Late or inadequate witness notice and calling an unnotified witness are separately addressed. Comment by another party on omitted legal points or the witness-notice category requires the court’s leave. The court must consider relevant explanations and, for a changed defence, the extent and justification of the change. No conviction may rest solely on the statutory inference. This is not automatic exclusion of a witness or an automatic finding of guilt.

Material obtained through compulsory disclosure is not a licence for unrelated publication or use. CPIA section 17(1)–(4) permits use for the proceedings for which it was disclosed, with a view to further criminal proceedings concerning the same matter (including an appeal), or in those further proceedings. It also permits use to the extent the object was displayed, or information communicated, to the public in open court, but not where that happened in section 18 contempt proceedings. Otherwise, the accused may apply for permission to use it for the purpose and to the extent authorised by the court. Under section 17(6), a prosecutor or interested person who asks to be heard must have that opportunity before permission is granted; section 17(8) preserves other restrictions on use. Knowingly contravening section 17 is contempt under section 18. CrimPR 15.7–15.8 govern the relevant application and contempt procedures. A defence team must secure the material and identify an actual permitted use before using it elsewhere. Confidential handling and the right to use material for a fair defence are complementary obligations.

The test and the public-interest process remain those explained in this section. Authorities: CPIA sections 3, 7A and 8; R v H and CKey caseR v H and C[2004] UKHL 3; CrimPR Part 15.