According to a Sotheby's catalogue note, "Whilst Julia was staying with the Cottin family as a lady's companion, she became the mistress of Colonel Josiah Cottin [...] and assumed the false name 'Mrs Johnstone'". The miniature painter William Wood made a pair of paintings of the couple, in 1800. Colonel and Mrs Cottin (Lavinia) had a Hampton Court apartment (Apartment 2, Suite XXI) from 1797; while George Brummell was brought up in Apartment 10, Suite XVIII with his father, who died in 1794. The "Hon. Mrs. Storer" had Apartment 7, Suite XIX from 1782 to the end of her life. (The reference only identifies her by the courtesy title, and tentatively suggests a later marriage to Francis Willis, which would have been in 1804.)Sarah E. Parker, Grace & Favour: A handbook of who lived where in Hampton Court Palace 1750 to 1950 (PDF) at pp. 18, 36, and 27
