No. When "US", "UK", "UN", "UAE" etc are used as nouns, they have the definite article "the" preceding them.
We are going to the US next week.
The UK held a referendum on EU membership.
The issue will be raised at the UN.
However, when they are used attributively, as though they were adjectives, there is no article.
UK law prohibits copyright infringement.
US senators serve six-year terms.
UN member states will discuss the issue.
Sometimes there's an article, but that's because the article is required by the following noun:
The US Constitution protects freedom of expression.
A US physicist has just won a Nobel prize.
Hence, we would refer to "UK English" and "US English" - although it is probably more common to call them "British English" and "American English".