oh dear, dear oh dear, oh dear.
There are many, many examples of it being used.
I did not once say it isn't used.
I said there is no such thing. Which, by definition, there is not.
The only reason anyone says "British English", is because there is a derivative version (US English) & because it is widely used.
The rules for derivatives are that they need to be seperated from the original, by being defined as something different.
This rule does not exist for the original, because it is not different.
Edit: I do not have a problem with the term being used, I am simply pointing out that it's actually a fallacy.
Great Britain is 3 countries: England, Scotland & Wales.
The language spoken in England, is English.
The derivative version of this language, which is spoken in Scotland, is Scots English. Actual Scots language is "Gaelic".
The derivative version of this language, which is spoken in Wales, is Welsh English. Actual Welsh language is "Cymraeg".
Hence there is no such thing as "British English".
The derivative version of this language, which is spoken in the United States of America, is US English.