A British man who was acquitted of spying for China has told the BBC he was a "convenient fall guy" for UK police and security services who wanted to put espionage threats by foreign states "on the map".
Chris Cash, a former parliamentary researcher, has shared more than 6,000 messages with us, revealing how a Chinese official sought information about sensitive political matters in the UK - including the 2022 Tory leadership battle to decide the next prime minister.
