Lieutenant-General Hart, who had made money in India and inherited valuable estates in his native county, represented Donegal from 1812 with the backing of the 1st marquess of Abercorn and the Castle interest. Emulating his ancestor Henry Hart (d. 1623), whose family had originally come from the West country, he was appointed governor of Londonderry and Culmore Fort at a salary of over £300 in January 1820 and continued to seek government patronage.
Hart, who divided against condemning ministers’ conduct towards Queen Caroline, 6 Feb., voted against Catholic relief, 28 Feb. 1821, 20 Apr. 1822. He again favoured inquiry into Anglo-Irish trade, 30 Apr., and supported reducing the Irish window duties, 16 May, but he withdrew his bill to allow commissioners of excise to licence small Irish stills on receiving assurances from ministers, 13 June, and sided with them against Hume’s motion for economy and retrenchment, 27 June 1821, and Brougham’s for more extensive tax reductions to relieve distress, 11 Feb. 1822.
He testified to the good conduct of the Irish yeomanry, 10 Mar., when, as on the 13th and 18th, he voted against tax reductions, though he commented that a higher duty on barilla would benefit the North of Ireland on bringing up a petition from the kelp manufacturers of Donegal to this effect, 13 June 1823.
Promising to continue his exertions on behalf of his constituents, Hart was again returned for Donegal at the general election of 1826 and in October he spoke at the Belfast dinner in honour of the leading anti-Catholic Lord George Beresford*, who had been defeated in county Waterford.
Brushing aside rumours that he would retire at the dissolution in 1830, he issued a circular to his supporters in which he dwelt on his 18 years’ tenure of the representation as ‘a connection which has become dearer to me in proportion to its continuance and which it is impossible for me voluntarily to abandon’.
Professing an ‘ardent affection’ for his county, Hart initially offered again for Donegal at the general election of 1831, when John failed to win a seat for county Londonderry. However, with his own popularity doubtful (one radical opponent described him as ‘universally scouted’), he withdrew on the pretext of old age, rather than risk a contest with two genuine reformers.
