More greenhouses were built and, by about 1880, 56 gardeners were employed. There were other building works in the grounds. Waterhouse created a grotto between the chapel and the stable yard, and designed the Parrot House and a loggia (now known as the Temple). The Chester architect John Douglas designed the Dutch Tea House in the Tea Garden, and a number of service buildings in the estate. In 1897–98 Edwin Lutyens started to improve what had been known as the Italian Garden (and is now the Dragon Garden). Work continued in the gardens and grounds during the 20th century. The 2nd Duke commissioned Detmar Blow, a pupil of Lutyens, to re-design parts of the gardens. With Fernand Billerey, he removed the parterres, built a canal leading away from the house, added hedged compartments to the terraces, and a pond at the base of the terraces (now the Lioness and Kudu Pond). During the Second World War, part of the parkland was requisitioned as an airfield, and in 1940 some of the garden buildings were damaged by a cluster of incendiary devices. After the war, improvement of the gardens did not resume until the 1960s, when the wives of the 4th and 5th Dukes worked with the designer James Russell. Since the early 1990s, the gardens have been further developed under the 6th Duke and his wife, Natalia, working with the garden designers Arabella Lennox-Boyd and Vernon Russell Smith. Formal gardens To the east of the house a series of terraces leads down to the Fish Pond. The retaining walls at the southern end of the upper terrace are listed at Grade II, as are the retaining walls at the end of the upper terrace and the steps leading down to the middle terrace. Stretching along the middle terrace is a long rectangular pool containing a three fountains. The retaining walls of this pool are listed at Grade II, as are the railings on the north and the south side of the terrace. On each side of the pool are two compartments framed by yew hedges. Between these compartments, on each side, is a statue by Raymond Smith. Both of these were made in 1852 for the 2nd Marquess and are listed at Grade II. The one to the north depicts a stag at bay, and that to the south a hunter on a rearing horse. From the end of the