An English businessman who bought a traditional 23,000-acre Scottish hunting estate in 2003 has spent more than two decades changing its heavily grazed landscape, planting one million native trees and successfully bringing red squirrels back to the glens. 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.

An English businessman who bought a traditional 23,000-acre Scottish hunting estate in 2003 has spent more than two decades changing its heavily grazed landscape, planting one…

Businessman Paul Lister transformed Scotland's 23,000-acre Alladale estate into a wilderness reserve, planting one million native trees and reintroducing red squirrels since…