[8] Boscawen had absolute control of the parliamentary representation of the boroughs of Tregony and Truro, and he exercised considerable influence on the elections for Penryn.
In 1720 he was raised to the peerage as Baron Boscawen and Viscount Falmouth, having been for some time discontented at the delay in his advancement to that position.
Both before and after the accession of George I he spent large sums of money in support of Whig principles, and was rewarded on his party's triumph by many valuable offices.
Boscawen was a groom of the bedchamber to Prince George of Denmark, steward of the duchy of Cornwall and Lord Warden of the Stannaries in 1708, Comptroller of the Household from 1714 to 1720, and joint Vice-Treasurer of Ireland from 1717 until a few months before his death.
[8] Their children included: Boscawen died suddenly at Trefusis, in Cornwall, aged 54, and was buried at St Michael Penkivel.