The BBC reports that British government officials forged documents to produce "fake news stories" during the Cold War. The Information Research Department (IRD) was the Foreign Office's secret propaganda unit. For 30 years it fed information to journalists and had its own news agencies too.
Those interested in the topic may be interested to know that the late Peter Newell, a member of the Socialist Party, conducted his own investigation into the subject of state-sponsored disinformation.
Secret History - How the British government controls and censors the news
Marx, the Cold War and the "Spooks"
Information Research Department - Notes and Quotes