3rd Duke of Grafton, Member of Parliament (1756-1757), 142-143 Spon Street (from 1757), Privy Counsellor (from 1765), 11th Prime Minister of the United Kingdom (1768-1770), Knight of the Order of the Garter (from 1769), Lord Privy Seal (1771-1775), and Lord Privy Seal (1782)