When the Royal Navy disclosed new warships

When did the Royal Navy release information about new capital ships and their capabilities?

Usually after laying down, with only broad facts such as gun calibre disclosed and detailed protection or arrangements kept secret.

Public notice did not amount to technical disclosure. The government normally acknowledged a ship once it had been laid down and might state a broad feature such as gun calibre. Precise armour thickness, layout, and other combat details remained protected. Historians can therefore find official acknowledgement without anything resembling a modern specification release.