BBC - An Army interpreter serving in Afghanistan, described as a "Walter Mitty" style fantasist, became an agent for Iran, a court has been told.
Tehran-born Daniel James, of Brighton, translated for Gen David Richards, the former UK commander in Afghanistan.
It is alleged he sent coded messages to an Iranian military attache in Kabul telling him "I am at your service".
Mr James, 45, denies two charges under the Official Secrets Act and wilful misconduct in public office.
Mark Dennis QC, prosecuting, said Mr James' role, working for the general, put him in an "unique position".
He said Mr James was a "Walter Mitty"-style fantasist who thought he had been snubbed for promotion.
"During the latter part of 2006, the defendant's loyalty to this country wavered and his loyalties turned to Iran, the country of his birth.
"He turned his back on those with whom he was serving in Afghanistan and sought to become an agent for a foreign power," said Mr Dennis.
He said Mr James was attempting to provide information to insurgents fighting coalition forces and others "who may yet become involved or who may directly or indirectly support the insurgent elements."
Mr James denies two charges under the Secrets Act of communicating information useful to an enemy and a second count of collecting such information on a USB memory stick.
