The green and gold glow of the sunlit Long Gallery contrasts well with the monotones of the classical Entrance Hall.

This room, 130ft long, occupies the whole length of the west front. It was refurbished in 1756-9 as a gallery for the Childs' large collection of pictures. Adam hung pea-green wallpaper. John Linnell is credited with the bulk of the furniture, including 12 mahogany armchairs and six settees, with seat rails matching the dado rails.

The Gallery has been used as a family room, described by Henry James as 'a cheerful upholstered avenue into another century' and by Margaret, Lady Jersey, wife of the 7th Earl, as an elegant, candle-lit reception room.

On the 1782 inventory, 49 paintings were listed including works by Rubens, Poussin and Van Dyck. Only a handful survived a disastrous fire en route to Lord Jersey's new home in Jersey in 1949.

The current arrangement is an evocation of the 18th-century hang. It has been achieved with loans and gifts, and is unrivalled in England as a collection of later 17th- and 18th-century Venetian painting.

Two Chinese imperial junks, conserved in 2003, have been at Osterley since around 1782, as has the pair of Chinese pagodas and a carved ivory marriage box. There are two pairs of Chinese famille rose mandarin jars and one pair of rose blue ground mandarin vases, made in the early part of the reign of the Chinese emperor Qianlong (1736-95).