Something of the
United Kingdom unless stated otherwise (Example,
Northern Irish person could say they're Irish rather than British).
Common mistakes include:
British = English,
British = English,
Welsh, Scottish and Irish
Corrected:
British = English, Welsh, Scottish and Northern Irish.
English is an example of British,
Scottish is an example of British,
Welsh is an example of British,
Northern Irish is a technical example of British,
Irish is NOT an example of British due to Irish
independence (Irish war of independence)