- Woolmington showed his wife a gun and said he would commit suicide if she left him to live elsewhere
- The gun discharged, killing the wife
- Could the conviction be quashed on the grounds that the judge said it was for the jury to decide whether Woolmington had proved that the evidence was in his favour?
- Yes, conviction quashed
- Subject to some exceptions, it is always for the prosecution to prove beyond reasonable doubt that the defendant committed the crime in question
- Common exceptions are the defence of insanity, which the defendant has the legal burden of proving, and where Parliament expressly wills to the contrary