Many people called it an act of war. The 2018 Salisbury Poisonings remains one of the most infamous criminal cases in British history - and Neil was the man who led the investigation.
In this episode, he reveals how police, the security services and MI6 worked together to identify the Russian agents who carried out the Novichok attack, and why he still lives in hope of bringing them to justice.
But should the local police and MI5 have known that former Russian double agent Sergei Skripal was living an apparently normal life in Salisbury? Andy challenges Neil on whether the failure to flag his presence was a justifiable decision or a dangerous blind spot.
Plus, they explain what you'll learn from the new CNN documentary The Salisbury Poisonings: The Spy Next Door, in which Neil plays a prominent role.
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