This first floor main passageway leads to the principal bedchambers of the house. Works on display include pieces acquired by the 3rd Earl of Bute, who was Prime Minister of Great Britain in 1762 under King George III, and would originally have hung in his Bedfordshire home, Luton Hoo. The collection includes works by Teniers and Van de Velde. Also on display are works by noted Scottish artists and all are set off by the vibrant green walls and sympathetic lighting.

The beautifully carved eighteenth-century chairs by Thomas Chippendale and Alexander Peter lining the corridor highlight the contrast between Chippendale's dynamic and organic shapes and Peter's more formal solid design.

On either side of the hall are virtually identical grand staircases; one made of stone and the other of wood. These would have been used by the whole household, as there are no secondary stairs for servants. Large Venetian windows at either end of the corridor give natural light to the gallery and staircases.