Unlike his father Blackwood supported the Union, but declined the peerage offered to him, which was then conferred upon his mother. He received £15,000 as compensation for the disfranchisement of Killyleagh and remained an important influence in local politics. Castlereagh wrote in 1802 ‘I wish to cultivate Blackwood’s friendship as very material to me in the county of Down’; but was satisfied that he would not offend him if he did not press then for promotion in the peerage for his mother. What Blackwood did wish, as he reminded the chief secretary, 25 Jan. 1804, was for promotion for his brother in the Church.
In 1807 he succeeded his mother to the barony of Dufferin and applied through the Irish government for a seat in Parliament. At first Westbury was earmarked for him, on the anticipated resignation of Glynn Wynn, but when that did not materialize, he was found another on the Duke of Leeds’s interest.
He rallied to Perceval’s ministry on the address and the Scheldt inquiry, 23, 26 Jan. 1810, and, after a visit to Ireland, returned to do so again on 5 and 30 Mar. The Whigs listed him ‘against the Opposition’. At this time he was ‘very loud’ in complaint about nothing having been done for his brother. He also wished for a seat at ‘one of the boards’ for another brother and, to crown it all, a representative peerage, though he was warned that the first two requests were more than could be reasonably expected. He voted against the discharge of the radical Gale Jones, 16 Apr., and against sinecure reform, 17 May 1810. In January 1811 he applied to be constable of Dublin Castle. The viceroy, who thought he rated himself ‘too high’, complained:
Lord Dufferin wanted his brother a bankrupt to have a situation. He wants another brother a wine merchant to have another situation and a clergyman to keep his living ... and have a valuable deanery. All this for one silent vote.
NLI, Richmond mss 63/556, 586; 73/1700, 1715.
Leave of absence prevented him voting with Perceval’s Irish friends on the Regency question, 1 Jan. 1811.
On 24 Feb. 1812, the day he voted in a ministerial minority, Dufferin secured an assurance from the Irish secretary that his brother would probably be made secretary to the accounts board in Ireland and ‘was quiet about his other brother’ on learning ‘that his claims would certainly be taken into consideration at a future period’.
Dufferin was again secured a seat through the agency of the Irish government in the election of 1812, but he had to pay 6,000 guineas to be a guest of Charles Fox Champion Crespigny at Aldeburgh. He survived a contest in absentia and the English Treasury proposed to ‘make a purse’ to relieve him of part of his expense.
Dufferin’s pretensions to a representative peerage were backed by Castlereagh in 1816, but the Irish government resisted them. Peel wrote to the viceroy: ‘Pray try to prevent Lord Dufferin from being forced upon us. He is the youngest peer, a baron of the Union.’
Dufferin died 8 Aug. 1836. As a landlord he had ‘a reputation of much intelligence and liberality, building schools, encouraging manufactures, and when necessary providing employment for the poor at his own expense’.
