Why parliament matters here
Parliamentary debate is one of the few formal public spaces where issues of conviction safety can be raised and placed on the record before a CCRC review concludes. While neither chamber has any power to direct the CCRC or the courts, parliamentary engagement serves several functions: it creates a public record of concern; it can prompt government ministers to address resourcing and procedural questions; and it places pressure on regulatory bodies — including the CCRC itself — to provide public updates on case progress.
In the Letby case, parliamentary attention has focused on two distinct but related themes. The first is the specific concern about conviction safety given the post-trial scientific evidence. The second is the broader systemic issue of how expert-evidence-dependent prosecutions are scrutinised at trial and on appeal — a question with implications well beyond this case, as legislators have noted in referencing the 2011 Law Commission proposals on expert-evidence gatekeeping that were not implemented.
House of Lords — Lord Hain debate (25 February 2026)
On 25 February 2026, Lord Hain secured a short debate in the House of Lords on conviction safety in prosecutions substantially dependent on expert evidence. The debate, listed under the Lords’ general debate procedure, ran for approximately ninety minutes and attracted contributions from peers across party lines.
Lord Hain’s opening statement addressed the Letby convictions directly, setting out the post-trial scientific developments — including the Shoo Lee Panel’s February 2025 report and the Joint Insulin Report of May 2025 — and arguing that the combination of post-trial scientific consensus and the structural features of the prosecution case raised serious concerns about conviction safety that warranted urgent CCRC attention. He drew comparisons with the Sally Clark and Angela Cannings cases, both of which involved convictions that collapsed following post-trial reassessment of expert evidence.
The debate also addressed the 2011 Law Commission report on expert evidence, which recommended the introduction of a statutory admissibility test for expert opinion evidence in criminal proceedings. Those recommendations were not enacted. Several peers noted that had such a gateway been in place at the time of the Letby trial, some of the expert evidence the prosecution relied upon would have faced a more structured admissibility scrutiny. The minister responding acknowledged the point but did not commit to legislative action.
House of Commons — Davis EDM (18 March 2026)
On 18 March 2026, David Davis MP tabled Early Day Motion 1247, which called on the government to ensure the CCRC had adequate staffing and resources to conduct its review of the Letby convictions without undue delay, and to consider expedited procedures in cases where post-conviction scientific evidence had reached a level of consistency that, in the signatories’ view, warranted urgent attention.
The EDM was explicitly cross-party in its framing, avoiding language that would pre-judge the CCRC outcome while making clear that parliamentary opinion held the resourcing and pace of the review to be a legitimate matter of public concern. Early Day Motions do not compel government action and are not debated on the floor of the House unless the government or Speaker grants time — but they create a formal record and provide a mechanism for gauging cross-party support.
Written questions and committee references
Alongside the debate and EDM, a number of written parliamentary questions were tabled in both chambers during the 2025–2026 session. Written questions addressed to the Ministry of Justice sought information about CCRC resourcing levels, average case completion times, and the commission’s approach to cases involving post-conviction expert-evidence developments. Responses from junior ministers acknowledged the questions without disclosing operational details of the Letby review specifically, citing the independence of the CCRC.
The Justice Select Committee received written submissions from campaigners and legal academics touching on the Letby case in the context of its broader inquiry into the criminal appeals system. No formal committee report specifically addressing the Letby convictions has been published, but the submissions are on the parliamentary record.
Cross-party signatories and engagement
The Davis EDM attracted signatures from MPs across the Conservative, Liberal Democrat, and independent benches, as well as some Labour backbenchers. The cross-party character of the signatories reflected the way in which the conviction-safety question has been framed by campaigners and their parliamentary supporters — as a matter of systemic justice concern rather than a partisan question.
In the Lords, contributions to the Hain debate came from peers with legal, medical, and scientific backgrounds. Several who spoke had previously engaged with the Sally Clark and Angela Cannings cases and drew on that experience in contextualising the Letby situation.
What’s pending
As of 25 April 2026, no further parliamentary debate specifically on the Letby case has been scheduled, though written questions continue to be tabled. The publication of theThirlwall Inquiry final report on 15 April 2026 generated renewed media and parliamentary interest, and further parliamentary questions on the relationship between the inquiry findings and the CCRC process are anticipated.
If the CCRC issues a further public update or reaches a decision on referral, it is expected to prompt a statement request in the Commons and potentially a further Lords debate. Campaigners have indicated they will seek parliamentary time for a full opposition day debate on conviction safety in expert-evidence cases if the CCRC process extends beyond 2026.