[gizmo686]

From Wikipedia on the Official Secrets Act [0]

> "The offences under the Act, that can be committed only by persons who, as the case may be, are or have been Crown servants, government contractors, or members of the security and intelligence services, can be committed only where the information, document or other article in question is or has been in the possession of the person in question by virtue of their position as such."

This seems less onerous then US laws related to classified materials. As with the UK, "normal" citizens are not bound by the law. However, those with a clearence are barred from speaking about classified material regardless of if they acuired access through their work. (They are also barred from reading classified materials, but that might be just a condition of maintaining clearence)

[0] https://en.m.wikipedia.org/wiki/Official_Secrets_Act_1989