The fashion world is fickle but Stella Tennant was a rare survivor, striding down catwalks and smouldering from magazine covers for almost 30 years. By the flighty and superficial standards of her industry, she seemed a beacon of substance: avoiding the party circuit, eschewing celebrity culture and refusing to have anything much to do with such social media fripperies as Instagram. Married for more than two decades, she and her French photographer-turned-osteopath husband, David Lasnet, raised their four children not in London, Paris or New York, but in an 18th-century manor house in rural Scotland where they would swim in rivers, grow vegetables and walk in the hills.