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Deary, whose Horrible Histories series have sold millions around the world and been turned into a TV franchise, said Corder had been convicted on circumstantial evidence and suffered terribly as a result.

McCourt did not give evidence during the trial but his defence argued that the prosecution's case was based on circumstantial evidence and that there were too many gaps in it that did not prove guilt.

Vikram Verma, who assisted the prosecution during the trial, said: "It was a difficult task for the prosecution to put together all the circumstantial evidence to convince the court beyond reasonable doubt about this conviction."

Speaking at Tuesday's news conference, Mark McDonald - the barrister leading Letby's defence - argued the circumstantial evidence was of "lesser" importance in the case against the nurse compared to the medical evidence.

It’s stretching the circumstantial evidence past the breaking point to suggest that Putin cut a secret deal with Benjamin Netanyahu: You get the Middle East, I get Ukraine.