After completing his education in Scotland, Ellice preceded his younger brother Edward to Montreal, whence his father had emigrated to preside over the London branch of his business firm.
Ellice seems to have had nothing to say at Westminster. He took leave of absence for illness, 29 Mar. 1808. His first known vote with opposition was on 26 Jan. 1810, on the Scheldt question. He voted likewise on 23 Feb., but with ministers on 30 Mar. The Whigs went so far as to list him a supporter of Canning, but Canning did not refer to him as such. He voted against the committal of Burdett to the Tower, 5 Apr. 1810, but against the release of Gale Jones, 16 Apr. He voted against parliamentary reform, 21 May 1810, as well as against sinecure reform 17 May 1810, 4 May 1812. He was in the government minority on the Regency, 1 Jan. 1811. On 21 May 1812 he voted against Stuart Wortley’s motion for a stronger administration.
Ellice did not contest the election of 1812. His Grimsby agent had warned him in the autumn of 1811 that unless he satisfied those electors who had not benefited by his largesse to date, he might as well stay away; and if he paid up, he must stand in conjunction with Loft.