James Hughes, a father-of-six from Northern Ireland, died at a hospital in Harrow A surgeon who served a jail sentence over the death of a patient at a private hospital has won an appeal against his conviction.David Sellu, now 69, was convicted of gross negligence manslaughter in November 2013 and handed a two-and-a-half-year prison term at the Old Bailey.On Tuesday, three Court of Appeal judges in London allowed his challenge against the conviction relating to the death of father-of-six James Hughes, from Northern Ireland. Mr Hughes, 66, died at the Clementine Churchill Hospital in Harrow, north-west London, after falling unexpectedly ill following knee surgery.The retired builder had a planned left knee replacement on February 5, 2010. The operation went well, but while recovering, he developed abdominal pain and was transferred to Mr Sellu’s care. It was the standard of the doctor’s care of Mr Hughes over a period of approximately 25 hours that formed the basis of the case against him.Appeal judges previously heard that the “essence” of the prosecution case was that the doctor, a “respected consultant colorectal surgeon”, should have performed an operation to repair a perforated bowel “at a much earlier time”.But a QC argued on behalf of Sellu, of Hillingdon, who served 15 months before being released in February last year, that his conviction for gross negligence manslaughter was “unsafe” on a number of grounds.Mr Sellu was present in court to hear Sir Brian Leveson, who heard the case with Lord Justice Irwin and Mr Justice Globe, announce that the conviction should be quashed.Sir Brian gave the prosecution 24 hours to make an application if they wish to seek a re-trial. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.