government 's listening post , unlawfully intercepted telephone calls and emails from sami al-saadi .
even though the legally-privileged material was protected by strict rules .
in a landmark ruling yesterday , the investigatory powers tribunal -lrb- ipt -rrb- the only judicial body with the power to investigate the security services .
now gchq has confessed it intercepted confidential conversations between mr al-saadi and his lawyer .