Hartley, who joined the Whig Club shortly after his defeat at the polls in 1784, regained the Berkshire seat in 1790, when he was returned unopposed on the interest dominated by Lord Craven. A ministerial newspaper trusted that he had ‘read his recantation of the errors of the Blue and Buff party’,
In response to events in France, however, Hartley, who stated his hostility to parliamentary reform, 30 Apr. 1792, took an alarmist line. On the address, 13 Dec. 1792, he voted with ministers, after making a declaration of general confidence in them, which he repeated when supporting the aliens bill, 31 Dec. 1792, with the rider that they would be expected to justify the measure once the crisis was over. Listed among Members ‘supposed attached’ to Portland at the end of 1792, he was deleted from Windham’s provisional list of potential recruits for the ‘third party’, but attended their meeting of 17 Feb. 1793 by invitation. He made a further pronouncement against reform, 21 Feb. 1793.
By the following June Hartley’s health was in ruins,
