Warrender’s father had been Member for Haddington Burghs, 1768-74 on the interest of Sir Hew Dalrymple, and when a vacancy arose there in December 1804 Warrender offered Sir Hew junior £800 a year for the seat. The latter demurred, commenting, ‘somebody has told him that he is under the guidance of Lord Binning [his friend at Oxford] and to prove the contrary (I really believe) he is determined to be in opposition’.
In 1807 Warrender, who had joined Brooks’s Club the year before, came in for the burghs after a contest, paying Sir Hew £4,500 for the Parliament. By his contract, apparently, ‘he was free to act as he pleased’ but he gave, as expected, ‘very cordial support’ to Sir Hew’s Grenvillite friends in opposition, speaking occasionally on their behalf, usually on military matters.
After his marriage in October 1810 to the younger sister of Lord Falmouth, who was a ministerialist, Warrender was more selective in his support for opposition. He voted with them on the Regency, 1 Jan. 1811, but being ‘a good natured man’, admired Perceval’s conduct in debate and did not obey their summons for 21 Jan., though he voted for Catholic relief and Irish tithe reform, 31 May, 6 June 1811. He at this time condemned ‘rats’ on the Whig side but said he would leave the Whigs if they allied with Canning.
Warrender discovered a great inclination to rat at the beginning of the session in consequence of a promise of a seat in the next Parliament from his beau frère Lord Falmouth. It was even supposed that the crime was consummated as upon the Household question [27 Jan.] he sat upon the other side and voted with them. In consequence when he got up at the end of the last Irish debate [4 Feb.], he had the pleasure of hearing among the shouts of ‘Question’ &c. a most audible cry from several quarters of ‘No rat’. The hint however was useful for he voted with us and did the same again last night and now professes that he never had any intention of leaving us.
NLW mss 2791, C. to H. Williams Wynn, 24 Feb. 1812.
On 4 Feb. he had declared that his vote was for Catholic relief and not directed against ministers. On 24 Feb. he was in the opposition majority against McMahon’s sinecure. He still wavered, for he voted with government against Turton’s censure motion, 27 Feb.,
Warrender subsequently transferred his loyalty to Lord Liverpool’s administration. At the election of 1812 he was returned for Truro on his brother-in-law’s interest, giving up his pretensions to Haddingtonshire, which he had nourished while still in opposition, to fall in with Lord Melville’s arrangements.
Although his brother-in-law wished him to retain his seat for Truro in 1818, Warrender elected to fight the government’s battle at Sandwich, which was ‘anything but a sinecure’.
