Eddison Manor

Eddison Manor was the country house of Lady Eddison and Colonel Hugh Curbishley and was situated near Guildford, Surrey. Inside there was a library and a dining room, and surrounding the house was a park. (TV: The Unicorn and the Wasp)

Behind the scenes
Although the exact location of Eddison Manor is never explicitly stated onscreen, the Enquirer newspaper features a blink-and-you'll-miss-it article on the disappearance of Christie, which states that Silent Pool is located near Guildford, Surrey. As Eddison Manor is located only a short drive from Silent Pool, we can conclude that it is also located near Guildford, Surrey.