British English (BrE, en-GB, or BE)[3] is the set of varieties of the English language native to the island of Great Britain.[6] More narrowly, it can refer specifically to the English language in England, or, more broadly, to the collective dialects of English throughout the British Isles taken as a single umbrella variety, for instance additionally incorporating Scottish English, Welsh English, and Ulster English.
https://en.wikipedia.org/wiki/British_English
https://learnenglish.britishcouncil.org/grammar/b1-b2-grammar/british-english-american-english
https://www.unr.edu/writing-speaking-center/writing-speaking-resources/british-american-english
British English
noun
: the native language of most inhabitants of England
especially : English characteristic of England and clearly distinguishable from that used elsewhere (as in the U.S. or Australia)
https://www.merriam-webster.com/dictionary/British English
https://www.ldoceonline.com/dictionary/british-english
https://www.cambridgeenglish.org/learning-english/parents-and-children/how-to-support-your-child/should-my-child-learn-american-or-british-english/