Just what happens when a foreign billionaire buys a vast tract of the Scottish Highlands and sets about changing it? Does Scotland’s biggest landowner Anders Holch Povlsen dictate everything that happens on his 80,000 acres of the Cairngorm National Park? Is he making money from it? Richard Baynes has been to the heart of Povlsen’s Wildland estate, talking to those charged with restoring nature on it and finding out how they work.