For aspiring Jedi knights, T-shirts advise "Calm you shall keep and carry on you must", with an outline of Yoda's head in place of the British crown ... on a bright red background.

There are thousands of t-shirts, mugs, and memes of the now-iconic red-and-white “Keep Calm and Carry On ... by hand on a solid color background, topped by a crown. The other two posters ...

These featured the crown of King George VI set against a bold red background, and three distinctive slogans - "Freedom is in Peril", "Your Courage, Your Cheerfulness, Your Resolution Will Bring Us ...