The present picture is most probably a study for a group portrait of Sarah Spencer, Lady Lyttelton and the Hon. William Lyttelton which hangs at Althorp. (Garlick no.308).
Sarah, Baroness Lyttelton (1787-1870), was governess to Edward VII. She was born Lady Sarah Spencer, eldest daughter of George John, 2nd Earl Spencer (1758 1834). For a portrait of her husband see lot 463.