Earlier this month, MI5 issued a stark warning to Westminster: a “covert and calculated” Chinese espionage campaign was targeting parliament - and doing so at an industrial scale. Not with trench-coats and dead drops, but with something far more mundane: LinkedIn messages.

This week, Gordon and David look at two high-profile cases of alleged Chinese-backed spying in Britain. Those in the frame always denied the allegations - and two of them, Chris Cash and Christopher Berry, were found not guilty when the case against them collapsed. So, what's going on behind the scenes, and if someone called Shirley contacts you via LinkedIn, should you respond?

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And of course, you can still join for yourself any time at therestisclassified.com or on Apple Podcasts.

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