Adam volume 14/14 refers to the third drawing room also as a lady's dressing room. It is therefore difficult to ascertain whether designs assigned to Lady Bathurst’s dressing room are meant for the third drawing room, or the subsequent room inscribed as a dressing room on the first floor plan (Adam volume 32/102).

Harris credits the execution of the Apsley House mirrors and girandoles to Sefferin Nelson, the carver and gilder appointed to execute Adam’s designs for Derby House. She notes a significant payment of £259 made to Nelson from Lord Bathurst’s account at Drummond’s, dating to 1779.