Bruce first stood for the Conservative Party at Gateshead in 1880 but was defeated; he failed again in 1883 at Newcastle, 1885 at Tyneside and 1886 at Barrow. He was finally returned to Parliament for Finsbury (Holborn Division) in 1888. In the 1892 election he was again returned for the Holborn division, but before Parliament sat he was appointed a Judge and had to resign his seat. He sat as a Judge until he retired in 1904. He was knighted in 1892 and in 1904 was appointed a Privy Councillor.
He specialised in shipping law. He was co-author with R G Williams of the textbook Admiralty Practice. Bruce died at his home near Bromley, Kent, aged 77.
Assessment
Patrick Polden described Bruce as "one of Halsbury's more questionable appointments".[citation needed]