One of only five remaining members elected to the 1796 parliament, Cartwright was ‘a Conservative of the old school’.
Cartwright had been returned on a vacancy for Northamptonshire in 1797, which his grandfather and great-grandfather had represented almost continually between 1695 and 1768. He was accurate in his recollection to Peel in 1841 that during the early years of his parliamentary career he had been one of Pitt’s ‘greatest admirers and firmest adherents’ – a position he publicly re-affirmed as a long-standing vice president of the triennial Pitt Club dinner.
Cartwright rarely spoke in parliament after 1832, which he attributed to his health not being ‘equal to the late hours and long speeches … now the fashion of the House of Commons’.
He played a role in the countrywide establishment of local agricultural associations that accompanied the rural distress of 1833–1836, and the nature of his involvement in the movement suggests that he was well aware of its potential electoral benefits.
Cartwright’s engagement at Westminster increased briefly during 1836 and 1837, however he remained silent on public legislation and his attendance of divisions was still below average. He tended to vote with Peel’s opposition, and started to pay particular attention to railway bills – himself introducing failed private legislation for a South Midland Railway between Leicester and Northampton.
Cartwright’s health deteriorated again towards the end of 1837, and his fragile condition was confirmed during his third consecutive uncontested election, when ‘his appearance indicated … extreme weakness and ill health’ and he was too unwell to be chaired.
Cartwright’s failing health finally prompted his retirement in acrimonious circumstances in February 1846. With the knowledge of Peel’s impending intention to repeal the corn laws, Cartwright informed his constituents that he was not fit enough to provide the level of representation that they required during what he termed ‘a crisis seldom surpassed in the history of this country’.
Cartwright died within a year of his retirement on 4 Jan. 1847. His two marriages had produced eight sons and five daughters, twelve of whom outlived him. His heir, Thomas (1794-1850), minister-plenipotentiary at Stockholm, predicted accurately that at his death Cartwright would still be in debt as a result of the lavish refurbishment of his Aynho estate, which had commenced in 1795.
