Kill and Fall, Spain's Head of Counterintelligence

A power play is made by leveraging the head of Spanish counterintelligence. He attempts to secure the briefcase, just as it's being held in San Fernando on the way to Madrid. And he fails. Only coming back with pictures of everything else in the briefcase but crucially, none of the sealed letters. This is how close the whole operation came to failure. The information is in the hands of Spanish intelligence. Their next job is to hand it over to the British.