Chocablog
However, the manufacturers of the chocolate bar have now revealed that it could have been completely different. Rowntree's (later taken over by Nestlé) had many ideas for the how its solid chocolate snack would taste and be branded. Now Nestlé historian Alex Hutchinson has discovered various rejected designs and ideas and shared them in a blog post to celebrate the chocolate bar's 40th birthday.
Had it not been not been for associations with the Second World War, the bar would have been called "Rations."
Here's the story of how Yorkie came to be the first openly sexist chocolate bar.