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English, the language spoken in the UK, is in the Indo-European group of languages,

USA = American English.

UK = British English.

Japan = Japanese.

(Note: there is a small difference in some spellings between USA and UK: tire, plow in the USA is tyre, plough in the UK.)

The official English languages are the varieties of English that are recognized as official languages within specific countries, territories, or organizations. Examples include American English in the United States, British English in the United Kingdom, and Australian English in Australia.

There are certainly french-speakers in the United Kingdom, but the dominant language of the United Kingdom is English. French does not have any legal status in any part of the United Kingdom although there are some languages closely related to French which are commonly used on the British Channel Islands.