Fitness to plead

When the question arises

Fitness to plead becomes a live issue whenever there is reason to doubt that a defendant can participate meaningfully in their own trial. In practice the concern is usually raised by the defence, often by a solicitor who cannot take coherent instructions, but the prosecution may raise it and the court may raise it of its own motion. None of the three is obliged to defer to the others.

Common triggers include a defendant who cannot give an account of the allegation, who appears not to recognise the seriousness of the proceedings, whose presentation in conference differs sharply from the account in the papers, or who has a known intellectual disability, psychotic illness, dementia or acquired brain injury.

Timing

The question should be determined as soon as it arises. Under section 4 of the Criminal Procedure (Insanity) Act 1964, however, the court may postpone the determination where it considers that course expedient and in the interests of the accused, up to any time before the opening of the case for the defence.

There may be an important practical reason to do so. If the prosecution evidence is insufficient and the case can properly end in an acquittal without a fitness determination, that outcome may be preferable to a finding of unfitness followed by a section 4A hearing. The decision is case-specific and remains one for the court.

The determination

The question is decided by the judge sitting alone. Before the Domestic Violence, Crime and Victims Act 2004 a jury determined fitness; that is no longer the case, and older material describing a jury’s role should be treated with care.

To find a defendant unfit, the court must have the written or oral evidence of two or more registered medical practitioners, at least one of whom is approved under section 12 of the Mental Health Act 1983 as having special experience in the diagnosis or treatment of mental disorder. The requirement applies only to a finding of unfitness, not to a finding that the defendant is fit (R v Ghulam [2009] EWCA Crim 2285). Two reports reaching the same conclusion do not bind the judge, and the determination remains the court’s alone: the question is for the court rather than the psychiatrists, even though psychiatric evidence is required (R v M (John) [2003] EWCA Crim 3452, para 32; R v Walls [2011] EWCA Crim 443). Save where unfitness is obvious, the court is expected to test the psychiatric evidence rigorously against each limb.

A practical point on instructing. Because two practitioners are required, it is worth establishing early whether the co-report will be commissioned by the same party or by the prosecution. Reports prepared in parallel without sight of one another frequently diverge on the facts relied upon rather than on the opinion itself, which wastes time at the hearing.

The trial of the facts

A finding of unfitness does not end the proceedings. Under section 4A of the Criminal Procedure (Insanity) Act 1964 a jury determines whether the defendant did the act or made the omission charged against them.

This is not a criminal trial determining guilt, and an adverse finding is not a conviction. Following R v Antoine [2001] 1 AC 340, the jury is generally concerned with the act or omission rather than the mens rea required for the offence. Defences based purely on mens rea, such as lack of intent or diminished responsibility, are therefore generally unavailable at this stage.

The distinction is not always as simple as separating a physical act from a mental state. R v Goldsmith [2024] EWCA Crim 780 confirms that there is no universal bright line between actus reus and mens rea. The ingredients of the particular offence must be analysed to identify the “act” or omission which section 4A requires the prosecution to prove, and in some offences that may include a mental component directly bound up with the act itself. On a charge of possession with intent to supply, for example, the jury must be sure of possession, which includes knowledge of the presence of the drugs, but not of the intent to supply.

Where there is objective evidence raising self-defence, mistake or accident relevant to whether the act was done, that issue may be left to the jury. The jury must be sure, on all the evidence, that the prosecution has proved the act or omission required by section 4A. If it is not sure, the defendant is acquitted.

R v Wells; R v Masud [2015] EWCA Crim 2 provides important guidance on the conduct of the section 4A hearing, including how the defendant’s police interview may be used, and Goldsmith gives the more recent analysis of the boundary between the act charged and mental elements of an offence.

Disposal

Where the jury finds that the defendant did the act or made the omission charged, section 5 of the Criminal Procedure (Insanity) Act 1964 provides three possible orders:

1. a hospital order, with or without a restriction order;
2. a supervision order; or
3. an absolute discharge.

A technical distinction matters. The hospital order is made under section 5(2)(a) of the Criminal Procedure (Insanity) Act 1964. Section 5A applies the relevant section 37 Mental Health Act 1983 machinery, with modifications, for the purpose of making that order. It should not be described simply as a hospital order made under section 37 following conviction, because a section 4A finding is not a conviction. R v Ismael [2024] EWCA Crim 301 expressly drew attention to this distinction.

Where the charge is murder and the statutory conditions for a hospital order are met, the court must make a hospital order together with a restriction order. In other cases the available order depends on the circumstances.

Where hospital disposal is under consideration, the psychiatric evidence should address the nature and degree of the mental disorder, whether hospital treatment is appropriate, whether appropriate medical treatment is available, risk, and whether admission can in practice be arranged. A recommendation that cannot actually be implemented is of limited assistance to the court.

The same applies to a supervision order, which cannot be made unless the intended supervising officer is willing to undertake the supervision. In R v Wood [2026] EWCA Crim 480 the doctors did not support a hospital order and neither the probation service nor the local authority would act as supervising officer, so the Court of Appeal was left with no option but an absolute discharge, despite its concerns about risk.

If the defendant later becomes fit

Unfitness is a finding about the defendant’s abilities at the relevant time rather than an immutable status, and treatment may restore fitness.

The procedural consequence depends on the order that was made. Where the defendant is subject to a hospital order together with a restriction order following the unfitness procedure, the Secretary of State has power to remit the defendant to court if they become fit so that the ordinary criminal proceedings can resume. That remittal route is not available following the other section 5 disposals.

The prospects of restoration therefore remain clinically important. A fitness report should, where possible, address whether the relevant impairment is potentially remediable, what intervention might improve it and over what period.

The magistrates’ court

The section 4 procedure applies in the Crown Court. There is no direct equivalent in the magistrates’ court, where a different and less formal route operates and the powers available to the bench are narrower. Material written about Crown Court practice should not be applied to summary proceedings without checking.

Neighbouring questions

Fitness to plead is regularly confused with other psychiatric issues in criminal proceedings. Each is a separate question with its own test and its own timing.

• Insanity concerns the defendant’s state of mind at the time of the alleged offence, under the M’Naghten Rules.
• Diminished responsibility is a partial defence to murder alone, under section 2 of the Homicide Act 1957 as substituted by the Coroners and Justice Act 2009.
• Automatism concerns whether the act was voluntary.
• Effective participation concerns the practical ability of a defendant to take part effectively in the proceedings. Criminal Procedure Rules Part 18 and the court’s wider case-management powers provide mechanisms for assisting a vulnerable defendant, including an intermediary where the relevant test is met, appropriate breaks, simplified questioning and other adjustments. These measures also operate within the broader requirement for a fair trial under Article 6 of the European Convention on Human Rights.

This distinction matters in practice. Many defendants who satisfy the Pritchard criteria nevertheless require substantial assistance to participate effectively. Conversely, the realistic adjustments available to a defendant may be relevant when deciding whether a particular Pritchard ability is genuinely beyond their capabilities. R v De Zoysa [2025] EWCA Crim 668 provides a recent example of extensive trial adaptations being taken into account when assessing fitness.

Reform

The Law Commission recommended in 2016 that the existing law be replaced by a modern statutory test focused on decision-making capacity and effective participation. The Government published its final response in November 2023 and accepted a majority of the Law Commission’s recommendations, but legislation replacing the Pritchard test has not been enacted. Pritchard, as restated in R v M (John) [2003] EWCA Crim 3452 and developed by later authority, therefore remains the current test.

Reform remains under consideration. In August 2026 the Ministry of Justice said that it agrees the law needs updating and is considering a wider range of disposals and ancillary orders where a defendant found unfit is found to have done the act. No legislation has yet been published. The current position is set out in more detail in Criticisms and reform.

The Mental Health Act 2025 is a separate reform programme. It received Royal Assent in December 2025 and some provisions have commenced, but most of its substantive reforms remain to be brought into force. It does not replace the Pritchard test.

The main criticisms of the test, and what a capacity-based replacement would mean in practice, are set out in Criticisms and reform.