To mark the First World War centenary, the Trust has devised Sanctuary From The Trenches, marking the largely Georgian house's wartime role as a military hospital.
Between 1917 and 1919 more than 280 soldiers were treated here for bullet or shrapnel wounds, trench foot, gassing or shell shock. They convalesced, sometimes for months, playing croquet and being served nectarines from the garden.
Six rooms were transformed into wards and an operating theatre was set up at the foot of the Grand Staircase.
Lady Jane Grey, teenage sister of house owner the 10th Earl of Stamford, became a nurse and even assisted in theatre. On our visit we stand by the operating table and listen to a recording of her from 1986.