In the context of the Meghari release, it is worth recalling the case of Ernest Saunders, who was one of the "Guinness Four" in the trial involving that company.
I quote from Jeremy Warner in the Independent:
In an appeal, the judge reduced Mr Saunders' sentence to two and a half years, after hearing evidence that Mr Saunders was suffering from pre-senile dementia. With parole, Mr Saunders qualified for almost immediate release, having served just 10 months. As soon as the former Guinness chairman was free,...(Gerald) Ronson (in his auto-biography "Leading from the front") recalls, "Saunders miraculously 'recovered', apparently the first person in medical history ever to do so."