Lets up the ante a bit....
Suppose you are on trial for murder. During the trial, a newspaper publishes an article in which they state you were captured on a surveillance camera buying petrol in a petrol station two hundred miles away from the scene of the crime at the moment you were supposed to be committing the murder. The video is clear, there no question that its you - the make, model and registration plate matches you car, and your credit card shows a timestamped transaction at the time on the video. Your defence counsel fails to get that video surveillance and present it in court, or to call the forecourt attendant as a witness - and you get convicted. Their evidence is disallowed at your appeal because it was available at the time of your original trial.
Does that make you guilty of the crime?
NOTE: I think is is a gross injustice that evidence is not valid because it was available at the time of the trial. If it is exculpatory, evidence ought to be available under any and all circumstances.
So, Person A is accused of shooting Person B.
Person A denies it or that there was any murder.
Britain's top medical doctors and pathologists testify under gruelling cross-examination witnessed by a jury of twelve drawn randomly from the electoral register (i.e., Person A's peers). The expert medics all swear under oath Person B died of a gunshot wound.
Person A has their own defence experts listed to challenge this view. Person A instructs their top drawer silk not to let their experts take the witness box.
Having heard all of the evidence presented in the hearing - and ONLY in the hearing, not a columnist in PRIVATE EYE or a propagandist writing sub judice articles in foreign newspapers to get around the CONTEMPT OF COURT, or some bimbo MP with a crush on BoJo writing a column in a clickbait tabloid - the jury after weeks of deliberation comes to its verdict.
Let's stop being fanciful and start being factual.
The court appointed experts in the Letby case are UK top endocrinologists, haematologists et al.
A whole selection of defence experts were lined up. Letby INSTRUCTED BEN MYERS, KC., a top silk, not to call them.
We can infer they were not called because it would become glaringly obvious that either (a) they couldn't disagree with the other medics, or (b) they would be forced to admit under oath and cross examination that (i) the death/s was unnatural and unexpected or (ii) a third party killed or harmed the baby in question.
Failing to send the case back to trial, along comes a PR agency to flood the media with an 'innocence' campaign to prey on the people's sympathies and gullibility, like the scammers they are.
Retired Canadian Dr. Shoo Lee is a mountebank and actually announced he was rewriting his paper for the purpose of helping Letby to evade justice.