From 1797 until his death Wycombe maintained a regular correspondence with Frances Stewart, Marchioness of Londonderry. She was the daughter of Charles Pratt, 1st Earl Camden, who had served in his father's ministry; the sister of the Viceroy in Dublin, 1st Marquess of Camden, John Pratt; and by her own account (writing to her friend, the United Irishwoman Jane Greg) a "republican countess". Wycombe's letters to Lady Frances reveal that he continued to entertain criticism of government policy in Ireland, including the Act of Union (which her step son, Lord Castlereagh, helped push though the Irish Parliament in 1800); of the Anglican church establishment with its tithes levied atop rack rents; of "British tyranny in navigation"; and of religion ("a bad substitute for common sense").
