Here's a high quality colouring page of the UK's national flag, the Union Flag (more commonly known as the Union Jack). Colour it in traditional (and correct) red white and blue, or go mad with other colours!
United Kingdom Flag Colouring Page
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United Kingdom National Flower Colouring Page
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Younger children can trace over the lines of the Union Flag (better known as the Union Jack) before colouring it in.
Cupcake Flags - UK
Print out a page of 12 cupcake flags. Grab some toothpicks and glue and you are ready to decorate your cupcakes! There are two pages in this pdf file - the first with the name of the flag, the second blank.