3: Make full use of Parliament.
If you want to announce something to Parliament, get a friendly MP to ask the question. Then "inform" Parliament by giving a written answer. Answer in general terms, promising to hide (sorry, place) the detailed evidence in the Commons Library (so it doesn't appear in Hansard, the official parliamentary record). With no Opposition these days, hardly anybody will look for it there.
Downside: Unfortunately there remain a few eccentric MPs who think their job is to search for this kind of thing.