Cameron Colquhoun has led the kind of life that would make Hollywood come knocking but which movie does he think is the most accurate?
He managed cyber terrorism operations for British Intelligence, has been a judge on a programme all about spies, worked closely with the Cabinet Office, briefed Ambassadors and ministers; he even went on operational tours of the Middle East.
It is not every day you can pick the brains of the Former Senior Analyst at Government Communications Headquarters (GCHQ) but that is exactly what Hal Stewart on Forces Radio BFBS' Totally Connected did.
In this frank and honest insight Cameron talks about as much as he is allowed to talk about having signed several secret papers but crucially he also reveals what he believes is the most accurate military movie ever made.
"Zero Dark Thirty was very good... to me it felt fairly accurate.
"There was a rawness to the way it was shot and filmed and I think it was fairly spot on."
Cameron is a judge on Channel 4's programme Spies in which three former spies put 15 men and women to the test to see if they have what it takes to make it in the world of espionage.
The programme, which first aired in January 2017, took him to locations like Morocco and highlighted the important work intelligence.
Hollywood often portrays the life of a spy as glamorous but is that really the case? Is the life of a cyber analysis just as exciting as fictional British Secret Service agent James Bond?
"At times it can be yes. It's fascinating because you have an optic on the world that not many people get to see. You go home at the end of the day and go 'wow, that was interesting' so you kind of process things in your head.
"The challenge, of course, is that you can't tell anyone else about it really unless it's your colleagues."
Have a listen above and see if you agree with his assessment or comment below if you have an alternative suggestion?