Sensitive information on MPs, China-related government policies and the 'inner workings of the British political system' were allegedly passed on by parliamentary researcher Chris Cash.
Sir Lindsay Hoyle warned that Parliament was not getting the 'protection it needs' amid a furore over the decision to drop charges against Chris Cash, 30, and Christopher Berry, 33.
The prosecution against Chris Cash, 30, and Christopher Berry, 33, collapsed last month when the Government refused to classify Beijing as a threat to national security.
Within minutes, police had dropped the extraordinary bombshell that they suspected the researcher, Chris Cash, had been passing secrets to Beijing for a year.
Matthew Collins initially provided an assessment for the Crown Prosecution Service (CPS) in support of the espionage case against parliamentary aide Chris Cash and teacher pal Chris Berry.