In January 2009, Thynn became chairman of Longleat Enterprises, a limited company which comprises operations at Longleat House and Safari Park on the family estate of Longleat, near Warminster in Wiltshire, as well as the commercial activities at Cheddar Gorge, in the Mendip Hills in Somerset. Following Lord Bath's retirement in 2010, Thynn hired a new chief executive, David Bradley, formerly of Legoland. Together they have worked with designers from Hollywood on improving the house and park; additions to the park include Jungle Kingdom, Monkey Temple, and Hunters of the Sky.