Pitt resigned as governor in 1735 with a considerable fortune, purchased what later became known as Orleans House Twickenham from the estate of James Johnston who died in 1737 and bought in January 1740 burgages and freeholds from Sir William Lowther which with Lord Galway's interest gave complete control of the Pontefract seat.
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In 1763 Pocock married Sophia (died 1767), the widow of his friend Commodore Digby Dent, daughter of George Francis Drake of Madras and step-daughter of George Morton Pitt who had inherited Pitt's house at Twickenham now known as Orleans House.
Johnston's later years were passed mainly at his residence (much later known as Orleans House) Twickenham, and he died at Bath in May 1737, see the separate article.