On his father’s death Whitbread inherited unencumbered landed property worth over £20,000 a year, but also some large debts, which had ‘rather increased than diminished’ by 1817. He had no stake in the profits of the family brewing business until 1819, when he and his brother Samuel Charles joined the controlling partnership and Whitbread himself secured a personal share in the trade of £45,000.
He was elected to Brooks’s on 7 May 1816, returned unopposed for Bedford on the family interest at the general election of 1818 and divided regularly with the Whig opposition during the first session of the new Parliament. He did not support Burdett’s motion for parliamentary reform, 21 June 1819, and, to Brougham’s disgust, refused to promote a county meeting in Bedfordshire to call for inquiry into the Peterloo incident,
