[1] Jebb took rooms in Parliament Street, London, and was admitted a licentiate of the Royal College of Physicians, on 24 March 1755.
He went to Italy to attend the Duke of Gloucester, and became a favourite of George III, who granted him a crown lease of Trent Park, 385 acres of Enfield Chase.
By 1768 he had resigned his hospital appointment to concentrate on private practice, and in the three years, 1779–81, his fees amounted to twenty thousand guineas.
He was attended by Richard Warren and Henry Revell Reynolds, but died at 2 a.m. on 4 July 1787 at his house in Great George Street, Westminster.
[2] He left much of his estate to his young Irish cousin and namesake Richard Jebb, who later became a distinguished High Court judge.