Unreformed House of Commons
"Unreformed House of Commons" is a name given to the House of Commons of Great Britain and (after 1800) the House of Commons of the United Kingdom before it was reformed by the Reform Act 1832 (and the Irish Reform Act 1832 and Scottish Reform Act 1832).
Until the Act of Union of 1707, which united the Kingdoms of Scotland and England to form Great Britain, Scotland had its own Parliament, and the term can be used to refer to the House of Commons of England (which included representatives from Wales from the 16th century). From 1707 to 1801 the term refers to the House of Commons of Great Britain. Until the Act of Union of 1800 joining the Kingdom of Ireland to Great Britain (to form the United Kingdom of Great Britain and Ireland), Ireland also had its own Parliament. From 1801 to 1832, therefore, the term refers to the House of Commons of the United Kingdom.