Holdsworth, R v

Where expert medical evidence was fundamental to the prosecution case, particular caution is required if the relevant scientific processes may be incompletely understood. A conviction is unsafe if fresh medical evidence presents a credible alternative explanation which cannot safely be dismissed as definitely incredible and might reasonably have affected the trial jury’s decision. The court should assess that question in the context of the case as a whole. Circumstantial material not put to the jury as an independent basis for conviction cannot readily be used on appeal as a substitute for a primary jury assessment. Fresh evidence may be admitted where the interests of justice require it under section 23 of the Criminal Appeal Act 1968.

The appellant was convicted of the murder of a two-year-old child at Teesside Crown Court before Grigson J on 8 March 2005. The prosecution medical evidence was that fatal brain damage followed severe blunt-force trauma inflicted shortly before the child collapsed while alone with the appellant.

The appellant sought leave to appeal out of time on the basis of fresh paediatric neurological, neuroradiological and neuropathological evidence. That evidence identified pre-existing brain abnormalities and advanced a possible alternative account: an epileptic seizure, potentially combined with an earlier subdural haemorrhage, might have caused the fatal hypoxic-ischaemic brain damage.

The central issue was whether that alternative medical account was sufficiently credible that the conviction was unsafe, and whether other circumstantial evidence independently established fresh trauma by the appellant.

1. Appeal allowed. The court granted permission to appeal and quashed the murder conviction as unsafe.

2. The circumstantial evidence did not independently establish that fresh trauma had been inflicted after the child was left with the appellant on the Wednesday evening. The prosecution had not advanced that case at trial, and the trial judge had not directed the jury on circumstantial evidence as an independent route to guilt. The material instead required primary assessments of weight and likelihood which this court could not satisfactorily make from the transcript and documents alone.

3. The medical evidence had converted a case of opportunity into certainty at trial. The safety of the conviction therefore depended upon whether the fresh evidence provided a credible alternative explanation consistent with the appellant’s account.

4. The court accepted that the child had abnormalities predisposing him to epileptic seizure and that an earlier subdural haemorrhage was medically possible. Although the prosecution expert regarded the proposed seizure explanation as untenable, the court could not safely dismiss the defence scenario as definitely incredible. It stressed the need for caution where scientific understanding may be incomplete, especially when expert evidence is fundamental rather than merely supportive of the prosecution case.

5. Applying the approach commended in R v Pendleton [2002] 1WLR 72, the court asked whether the fresh evidence might reasonably have affected the trial jury’s decision. It might have done so. The interests of justice therefore required admission of the evidence under section 23 of the Criminal Appeal Act 1968, and the conviction was unsafe.

6. The court added that any retrial would require careful case management, particularly arrangements for experts to confer, identify agreement and disagreement, and give reasons for any disagreement, as noted in R v Harris [2006] 1 Cr App R 5.

• Court of Appeal (Criminal Division) Granted permission to appeal on fresh medical evidence and quashed the appellant’s murder conviction as unsafe.

• Crown Court at Teesside The appellant was convicted of murder before Grigson J on 8 March 2005.