A businessman bought a 23,000-acre Scottish sporting estate and spent two decades rewilding it; one million native trees later, red squirrels have been reintroduced

• Paul Lister bought the Alladale estate in Sutherland, about an hour north of Inverness, when it was mainly used for traditional activities such as deer stalking and salmon fishing.
• Over the past 23 years, the property has been transformed into the Alladale Wilderness Res