Dougie steps out into an epic landscape, as he visits the biggest national nature reserve in the country, Mar Lodge Estate. Covering 29,000 hectares, and with 15 munros of the eastern Cairngorms, he sees the major regenerative work in the restoration of the ancient Caledonian forest. Dougie also reports on a project on the other side of the Cairngorm mountains that will see the release of captively bred Scottish wildcats later this spring.