A defence worker from Essex who spied for the Russians is due to be sentenced on Friday.
Parr was going to sell secrets for £130,000
Ian Parr, an aircraft engineer, worked for BAE Systems Avionics in Basildon.
He was arrested last year in a Southend pub after a joint operation by MI5 and the police.
Parr, 45, of Tylney Avenue, Rochford, pleaded guilty at the Old Bailey in November to two charges under the Official Secrets Act, and seven under the Theft Act.
He obtained secret information from British Aerospace Ltd and passed it on, contrary to the Official Secrets Act.
The charges related to the Storm Shadow project to develop stealth cruise missiles.
The theft charges concern the taking of information relating to Storm Shadow
and six other sensitive projects.
The former soldier and father-of-two was trapped after handing over documents in a plastic bag to a man in a pub whom he thought was a Russian agent, but was in fact a British spy.
Parr had arranged to sell the material for a total of £130,000.