This story was published in 1998. When I found it I just thought it was the usual media hyperbole over a few scraps of paper. Not so. Churchill's plan for Third World War against Stalin http://www.telegraph.co.uk/htmlContent.jhtml?html=/archive/1998/10/01/nwar01.html
Analysis by John Keegan, Defence Editor The West had to protect itself against http://www.telegraph.co.uk/htmlContent.jhtml?html=/archive/1998/10/01/nwar201.html
The 37 page file for Operation Unthinkable, scanned as individual jpegs. Well worth a read: http://www.history.neu.edu/PRO2/