The report from think tank the Henry Jackson Society says there are 200 Russian case offices in the UK handling up to 500 agents.
According to the report as many as half of the Russian expats in London could be informants for the Russian intelligence service, amounting to 75,000 potential assets.
The report’s author Dr Andrew Foxall said: “This report shines a light upon the activities of Russia’s cloistered intelligence agencies in Britain. The threat they pose harks back to a darker age.
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