The English language as written and spoken in the United Kingdom (in contrast with other places, particularly other countries where English is predominant or at least an important language)
Of or relating to, or spoken or written in British English.
The generalised variety of English spoken and written primarily in the United Kingdom and its former colonies, frequently excluding Canada; always excluding the United States of America. (ie. non-North American English)
The group of varieties of English used in the ex-colonial member states of the Commonwealth of Nations, in distinction to the varieties used in Britain itself