In 1790, Vyner had been expected to stand for
Lincoln, but did not do so. He entered Parliament for
Lincolnshire in 1794, on the vacancy caused by the elevation of his half-brother
Charles Anderson-Pelham to the peerage as
Baron Yarborough. His father, who also sought a peerage, assured the Duke of Portland that Vyner was well disposed to government. His competitor for the county seat,
Sir Gilbert Heathcote, was not quite of age and he was unopposed. Despite his father's claims, and perhaps because of his disappointment about the peerage, he joined him in opposition. He was spared a contest in 1796, his colleague withdrawing in favour of Heathcote. His father too retired. "He remained in opposition—though silent in the House—voting with them on supply and against the imperial subsidy." ==Personal life==