What is the political structure of united kingdom?

Answer 1

if you mean social class:

The Queen retains her position at the top of the social structure

the basic is, Monarch, Upper Class, Middle Class, then Working/Lower Class..

or a more complex version:

Royalty/Monarchy

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The Upper Class

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The Middle Classes:

• Upper middle Class
• Middle middle Class
• Lower middle Class

Lower Class

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The Underclass

Answer 2

parliamentary monarchy