Prosecutors have dropped charges against two men, including a former parliamentary researcher, who had been accused of spying for China.
Christopher Cash, 30, and Christopher Berry, 33, had both denied accusations of providing information prejudicial to the interests of the state in breach of the Official Secrets Act between December 2021 and February 2023.
It was alleged they obtained, recorded and published information "for a purpose prejudicial to the safety or interests of the state" and which could be "directly or indirectly, useful to an enemy".
They were due to go on trial next month, but prosecutor Tom Little told London's Old Bailey they would offer no evidence against the pair.
He said: "We simply cannot continue to prosecute."
A spokesperson for the Home Office said it was