An independent investigation into the activities of Kweku Adoboli, the ex-UBS trader accused of causing $2.3bn of losses last year, uncovered three instances of unauthorised trading at the Swiss bank that were unconnected to him, a court has heard.

Charles Sherrard QC, counsel for the defence, today said that the instances were mentioned in an addendum to a final report by KPMG into Adoboli's alleged losses.