Ex-Parliamentary researcher ordered not to contact MPs after China spy charges
Christopher Cash is accused of an offence under the Official Secrets Act.
Official Secrets Act
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Three Bulgarian nationals charged after probe into official secrets law breaches
Two people from Harrow and one from Norfolk have been arrested and charged with possession of false identity documents with improper intention.
What is the Official Secrets Act and how can it be enforced?
Scotland Yard has launched a criminal investigation into the leak of diplomatic dispatches sent by Britain's US ambassador Sir Kim Darroch.