Serco tagging trial collapses after SFO declines to bring evidence Two former executives have been found not guilty after the Serious Fraud Office admits to ‘errors’ in disclosing materials for trial 26 April 2021 • 2:56pm The Serious Fraud Office is facing fresh embarrassment after the trial of two former Serco executives accused of “fraud on the taxpayer” collapsed because of failures in preparing evidence. The white-collar crime agency admitted it had “uncovered errors made in the non-disclosure of certain materials” in relation to the trial of Nicholas Woods and Simon Marshall, who worked on Serco's contract to electronically tag offenders for the Ministry of Justice (MoJ).