After the Act of Union, he sat in the House of Commons of the United Kingdom for 1801 to 1806 as MP for County Tipperary.
[2] John Bagwell ran unsuccessfully for Cork City in 1775 and in 1792 was declared a member for County Tipperary in the Irish House of Commons by a committee of the House of Commons, sitting until the Union with Great Britain in 1801.
[3] During the Act of Union debates he controversially changed his vote twice, 'to the disgust of the [then] Lord Lieutenant', Charles Cornwallis.
Bagwell went on to support the government of William Pitt the Younger, but expected certain appointment for his sons in return, namely 'a deanery for Richard, full-pay employment in the army for John and succession to his colonelcy of the county militia for William.'
Bagwell never gained a peerage, the Chief Secretary stating that he believed it was 'because of a nickname'.