Secret wartime papers exchanged between MI5 officials reveal that the Nazis’ plans to conquer Britain included a deadly assault on Sir Winston Churchill with exploding chocolate.

Adolf Hitler’s bomb-makers coated explosive devices with a thin layer of rich dark chocolate, then packaged it in expensive-looking black and gold paper, The Daily Mail reported,

The Germans planned to use secret agents working in Britain to discreetly place the bars of chocolate - branded as Peter's Chocolate - among other luxury items taken on trays into the dining room used by the War Cabinet during the Second World War.

Churchill (seen, left, dining on board a plane) could have been killed by the plot involving lethal chocolate (file photo). Hitler’s bomb-makers coated explosive devices with a thin layer of rich dark chocolate, then packaged it in expensive-looking black and gold paper.

The lethal slabs of confection were packed with enough explosives to kill anyone within several metres.

But Hitler’s plot was foiled by British spies who discovered they were being made and tipped off one of MI5’s most senior intelligence chiefs, Lord Victor Rothschild.

Lord Rothschild, a scientist in peace time as well as a key member of the Rothschild banking family, immediately typed a letter to a talented illustrator seconded to his unit asking him to draw poster-size images of the chocolate to warn the public to be on the look-out for the bars.

His letter to the artist, Laurence Fish, is dated May 4, 1943 and was written from his secret bunker in Parliament Street, central London.