The director of public prosecutions said the case collapsed because evidence could not be obtained from the government referring to China as a national security threat.
This row within a row relates to the three witness statements submitted by Deputy National Security Adviser Matthew Collins, on whether China had been regarded as a threat at the time of the alleged offences under the previous Conservative government.
The CPS has now said: “The statements were provided to us for the purpose of criminal proceedings which are now over.
“The material contained in them is not ours, and it is a matter for the government, independently of the CPS, to consider whether or not to make that material public.”
Mr Cash, a former parliamentary researcher, and Mr Berry were charged under the Official Secrets Act in April 2024, when the Conservatives were in power.
They were accused of gathering and providing information prejudicial to the safety and interests of the state between December 2021 and February 2023.