Tomline, the son of Pitt’s confidant and biographer, was returned for Truro on Lord Falmouth’s interest in 1818, but he and his colleague Lord Fitzroy Somerset were again opposed in 1820 by two candidates representing a section of the corporation hostile to the patron. A local newspaper reported that, ‘finding he had no chance of success’, Tomline ‘cut and run, without taking leave’, and that he made an approach to his former constituency of Christchurch. In the event, no opening was available there and he came bottom of the poll at Truro.
His attendance was very poor, and he is not known to have spoken in debate. He divided against Catholic relief, 6 Mar. 1827. Early in 1828 he wrote to the new prime minister, the duke of Wellington, claiming that he was entitled to a baronetcy (he had been unable to succeed to the Pretyman title when his father died the previous year), but consideration of his application was postponed.
Tomline briefly reappeared in the Commons as Member for Minehead, where he was returned unopposed at the general election of 1830 with the borough’s patron, John Fownes Luttrell. The Wellington ministry reckoned him as one of their ‘friends’, and he duly voted with them in the crucial civil list division, 15 Nov. 1830. He divided against the second reading of the Grey ministry’s reform bill, 22 Mar., and for Gascoyne’s wrecking amendment, 19 Apr. 1831. The ensuing dissolution marked the end of his parliamentary career. Tomline’s father had accumulated a fortune during his career in the church, leaving on his death in 1827 a personal estate which was sworn under £200,000.
