Video: Chris Grayling 'astonished' by G4S and Serco tagging contract Chris Grayling, the Justice Secretary, has asked the Serious Fraud Office to investigate security firm G4S after a review found the Government had been overcharged by tens of millions of pounds in its electronic tagging contract. Mr Grayling, described the findings as a "wholly indefensible and unacceptable state of affairs." He told the House of Commons that the Government had been charged for people back in prison, people who had left the country, people who had never been tagged in the first place and even people who were known to have died. "The House will be surprised and disappointed - as was I - that staff in the Ministry of Justice were aware of a potential problem and yet did not take adequate steps to address it," he said. The Government is now planning to secure a refund for extra payments, Mr Grayling told the House of Commons that G4S has refused to take part in an additional audit so the Government can rule out the possibility that that dishonesty was involved in any of the contracts, while Serco has agreed to this demand.