Lawyers for Tom Hayes, convicted in August as the mastermind of a global interest-rate-rigging scandal, argued on December 1 for his conviction to be overturned and his 14-year prison sentence to be reduced.

Hayes's lawyers appeared before a panel of three judges in the Court of Appeal. They argued that the judge in his trial, which ran for nine weeks over the summer, gave improper instructions to the jury and wrongly excluded certain evidence that would have helped the defence.