You are assuming they're the same thing. They're not.
England is country in the United Kingdom.
The United Kingdom contains England, Wales, Scotland and Northern Ireland
Great Britain is the island containing England, Wales and Scotland.
The full name of the UK is 'The United Kingdom of Great Britain and Northern Ireland'
Which name you use is not a matter of style but of what you're talking about.
If you're talking about the nation as a whole, 'UK" is correct.
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