A younger son of the second earl of Harewood, Lascelles ‘entered the Navy young’, before transferring to the army for a brief career. Described by the Whig Thomas Creevey as being ‘of the most Tory cast’, he was returned on the family interest at Northallerton in 1820, but made way for his older brother in 1826, instead coming in for East Looe. Returned again at Northallerton in 1831, he opposed the reform bill, although he had supported Catholic emancipation.
The Harewood interest chose not to challenge for the enlarged Northallerton seat in 1832, a decision which angered Lady Caroline, who believed that her father-in-law might have brought Lascelles in.
At the May 1835 West Riding by-election, Lascelles proposed John Stuart Wortley, who stood unsuccessfully against Morpeth.
In Parliament, Lascelles was more active in the committee-rooms than in the chamber. He served on the inquiry into election petition fees, which recommended the abolition of various charges in order to lower petition costs.
A very infrequent speaker, Irish questions prompted the bulk of Lascelles’ contributions, an interest which perhaps reflected Morpeth’s position as chief secretary for Ireland. He initially divided generally with the Conservative party, opposing ministers on their motion for an inquiry into the pension list, 8 Dec. 1837, and on Irish tithes, 15 May 1838, stating on the latter that he was ‘decidedly opposed’ to appropriation. He was, however, one of two Tory rebels against Peel’s amendment to fix the Irish municipal franchise at £10 clear of all deductions, 11 June 1838, and a week later defended the ‘painful necessity of voting against his friends’, because this amendment would have made the Irish franchise higher than that of Scotland or England. The following year, claiming not to have voted against Russell so far that session, as the Conservatives supported the government conscientiously when they could, he reluctantly divided against ministers on the government of Ireland, 19 Apr. 1839, a vote criticised by the Leeds Mercury for its ‘great inconsistency’.
His parliamentary conduct, particularly his vote on the sugar duties, prompted some Wakefield Conservatives to sign a memorial expressing dissatisfaction with Lascelles.
Lascelles resumed his active committee work after 1842, serving on Roebuck’s inquiry into alleged compromises on election petitions.
Facing the ‘deep wrath’ of his Conservative supporters, for whom he ‘had grown too liberal’, and with the circumstances of his seating on petition in 1842 meaning that he could not expect ‘a friendly hand’ from Wakefield’s Liberals either,
Lascelles died in harness in July 1851 at his Kensington residence, ‘from an affection of the brain, which from the first symptoms defied all medical skill’.
