By the general election of 1820, when he was absent touring the northern European courts, Lowther had forfeited the confidence of his uncle and patron the 1st earl of Lonsdale, and he owed his third return for the family borough of Cockermouth to his father’s supplications on his behalf and usefulness to Lonsdale as Member for Cumberland.
In 1821 and for the remainder of the 1820 Parliament Lowther, of whom a radical publication of 1825 noted that he ‘attended frequently and voted with ministers’, divided steadily with his father at his cousin Lord Lowther’s* direction.
Lowther, who received three weeks’ leave on urgent business after serving on the Dover election committee, 16 Mar. 1827, divided with his father as previously in the 1826 Parliament, against Catholic relief, 6 Mar. 1827, 12 May 1828, and with the duke of Wellington’s ministry against ordnance reductions, 4 July 1828. Their patronage secretary Planta correctly doubted his support for Catholic emancipation in 1829, and he divided against it, 6, 18, 30 Mar. He joined Lord Lowther in opposing the Northern Roads bill, 3 June 1830. Condemned as ‘an ass ... or worse’ by Lonsdale’s son-in-law, the judge advocate Sir John Beckett*, for proposing a toast to the Whig lawyer Henry Brougham* at the assize ball in Carlisle shortly before the 1829 by-election, he was again rejected for Cumberland by Lonsdale, who suggested him for Plympton at the general election of 1830.
Though counted by the Wellington ministry among their ‘friends’, Lowther, like his father, was absent from the division on the civil list by which they were brought down, 15 Nov. 1830. Lonsdale, who anticipated an immediate dissolution, dismissed him as lazy, ineffective and of no use ‘beyond that of attending a committee of the House of Commons’, and was as reluctant as ever to seat him for Cumberland, though his father’s retirement was now certain.
Lowther found the constant attendance required of him as an opponent of ‘the odious reform bill’ in 1831-2 particularly irksome.
Lowther ceased to act with the Lonsdale Lowthers and was defeated at York on the Conservative interest in 1832 and again at the 1833 by-election, when he declined nomination and went abroad. He topped the poll there in 1835, 1837 and 1841 and was cleared by the parliamentary inquiry of 1835 of personal involvement in bribery.
