The agents visit MI5 | Blue Peter
Blue Peter continues the mission to find CBBC Intelligence Officers. Over 5000 viewers applied but only three get the chance to go inside MI5's Headquarters.
TweetSimilar broadcast resources
![](https://era.org.uk/app/uploads/2021/01/CBBC-Blue-Peter-Project-Enigma-–-Cracking-codes-in-London-400x230.jpg)
Project Enigma - Cracking codes in London | Blue Peter
The competition winners use a replica working Enigma machine to crack their own puzzle set by GCHQ.
![](https://era.org.uk/app/uploads/2021/01/CBBC-Blue-Peter-Project-Enigma-–-GCHQ-Tour-and-challenge-400x230.jpg)
Project Enigma - GCHQ Tour and challenge | Blue Peter
The competition winners, get their first look inside GCHQ and are given their top-secret mission to crack.