Immigration control must be firm but also fair. Last Tuesday, the courts ruled that Jimmy Mubenga was unlawfully killed while being escorted to the airport by G4S, and two days later the Justice Secretary said that G4S and Serco had been overcharging his Department over a number of years. Given that those two companies hold contracts worth £180 million with the Home Office, will my hon. Friend initiate an audit into the quality of their immigration work as well as their charging policies, to ensure that his Department has not been overcharged?