In this final episode, we have the first ever interview with serving MI5 officers who work in counter intelligence.

Tom and Kate talk about the challenge of grey zone threats from Russia and reveal their shock at the Salisbury spy poisonings.

They also reveal that the Security Service has bolstered protection for people in the UK deemed at risk from Russia and is doing “everything we can” to prevent another Salisbury-style attack, but there are no “absolute guarantees” – in the grey zone.

Guests:
- Tom, senior MI5 intelligence officer working on Russia
- Kate, MI5 intelligence officer investigating the activities of Russia’s military intelligence agency, the GRU
- Lord Mark Sedwill, former UK national security adviser
- Dominic Grieve, former senior Conservative MP, former chair of Parliament’s Intelligence and Security Committee, former attorney general

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