Shearman & Sterling has lost a litigation mandate after Robert Tchenguiz traded the US firm for Stephenson Harwood in a £300m case against the Serious Fraud Office. Stephenson Harwood partner Sean Jeffrey was named as Mr Tchenguiz's lawyer, who is replacing Shearman partner Josanne Rickard.  Mr Tchenguiz and his brother, Vincent, are suing SFO for trespass, wrongful arrest, human rights breaches, misfeasance in public office and malicious prosecution. The lawsuit began in January of this year. Source: The Lawyer