Background
Blackett was the son of John Blackett of Newby Park (the second son of Sir Edward Blackett, 2nd Baronet) and his wife Patience Wise.
Blackett was the son of John Blackett of Newby Park (the second son of Sir Edward Blackett, 2nd Baronet) and his wife Patience Wise.
Trinity College.
He sold Newby Hall, Ripon, Yorkshire, the family seat since 1690, to William Welland in 1748. He was High Sheriff of Northumberland 1757–1758 and in 1768 became Member of Parliament for Northumberland until 1774.
13th Parliament of Great Britain.