Growing up in a remote corner of the Scottish West Highlands, animals and nature have always been at the heart of Polly Pullar’s world. But an otherwise idyllic childhood was marred by family secrets which ultimately turned to tragedy. As her new book The Horizontal Oak is published, she tells us how the natural world has given her the strength to rebuild her life. There’s a single oak high on the flank of Ben Hiant, overlooking the Sound of Mull. I have known this resilient tree since my early childhood. It’s in a place I love very much. Massaged by…