SECRET information could best be rectified by a successful prosecution under the Official Secrets Act. (2) Invited the Security Service, as a matter of urgency, to take all possible steps to collect the evidence necessary to support such a prosecution. (3) Agreed that it would be premature to approach the Director of Public Prosecutions before the necessary evidence had been obtained. Security of Prototype Aircraft and Aero Engines Policy THE COMMITTEE considered a memorandum+ by the Security Service on the future policy with regard to the security grading of aircraft and aero engine prototypes.