With access to recently-opened court files, Julie Etchingham reveals some of the Stasi's UK operations and asks why its other secrets are yet to be revealed.
| Actor | Role |
|---|---|
 Julie EtchinghamSelf | Self |
| SSiegfried WittenburgSelf (Photographer) | Self (Photographer) |
| WWolfgang WelschSelf (Former Stasi Prisoner) | Self (Former Stasi Prisoner) |
| KKatja HoyerSelf (King's College London) | Self (King's College London) |
| AAnne McElvoySelf (Author & Journalist) | Self (Author & Journalist) |
 Tom TugendhatSelf (Security Minister) | Self (Security Minister) |
| SSir Graham WatsonSelf (Former MEP) | Self (Former MEP) |
| FFelix MüllerSelf (Stasi Museum) | Self (Stasi Museum) |
| AAnnie MachonSelf (Former MI5 Officer) | Self (Former MI5 Officer) |
| SSimon Cranfield-ThompsonSelf (Former Special Branch Detective) | Self (Former Special Branch Detective) |
| BBernd RothSelf (Former Stasi Officer) | Self (Former Stasi Officer) |