Notebooks kept by Sir Norman Brook, the former wartime deputy cabinet secretary, "reveal Churchill to be a ruthless commander who was prepared to override moral and legal considerations to defeat Germany," according to the Daily Telegraphs arts (!) correspondent.
The notebooks, kept in a form of shorthand, were made public by the National Archives. Among other things, Brooks notes claim that Churchill planned to execute Adolf Hitler in the electric chair if the Nazi leader fell into Allied hands. There is more on Ghandi, de Gaulle, retribution, etc.