On Grenville's death in November 1770 Whately attached himself to Lord North, and acted as the go-between for his old patron's friends. Junius denounced him as possessing "the talents of an attorney" and "the agility of Colonel Bodens" (who could scarcely move), and for deserting Grenville's cause. He was appointed a commissioner on the board of trade in January 1771, the keeper of his Majesty's private roads in January 1772, and under-secretary of state for the northern department in June 1771. These appointments he held for the rest of his life.