How to be a spy in the digital age
9 December 2018 Last updated at 10:51 GMT
The head of MI6 has just revealed a huge secret - his first ever mission
But more than 20 years on from that, the demands on agents have massively changed.
It's no longer just a matter of trench coats, cocktails and false identities. So what does it take to be a spy in the digital age?
Produced by Emily Wolstencroft.