At the general election of 1796 Hobhouse stood for parliament at Bristol without success, but in February 1797 he was elected M.P. for Bletchingley in Surrey, in 1802 for Grampound in Cornwall, and in 1806 for Hindon in Wiltshire. He then represented Hindon till he withdrew from political life in 1818. In 1803 he took office under Henry Addington as secretary to the board of control. He resigned this post in May 1804, and in 1805 was appointed chairman of the committees for supplies. He was also first commissioner for investigating the debts of the nabobs of the Carnatic.[2]
A Treatise on Heresy as cognisable by the Spiritual Courts, and an Examination of the Statute of William III for Suppressing Blasphemy and Profaneness, 1792.
A Reply to F. Randolph's Letter to Dr. Priestley; or an Examination of F. Randolph's Scriptural Revision of Socinian Arguments, Trowbridge, 1792; another edition, Bath, 1793. Answered by Francis Randolph in Scriptural Revision of Socinian Arguments, vindicated against the Reply of Benjamin Hobhouse, 1793.
Three letters addressed to "the several Patriotic Societies in London and its neighbourhood" and to the editor of the Morning Chronicle, occasioned by the "prevailing disposition to riot and insurrection", 1792.
An Inquiry into what constitutes the Crime of compassing and imagining the King's Death, 1795.
Remarks on several parts of France, Italy, ... in the years 1783, 1784, and 1785, Bath, 1796.