But the author's life-affirming account of how her husband's illness and losing their money and home put them on a 630-mile coastal walk has been called into question.
The Observer has claimed that not all of the couple's story stacks up - something strenuously denied by the author.Niall goes through the claims with Sky News arts and entertainment producer Jayson Mansaray and hears from a journalist who has interviewed Winn, Charlotte Lytton.
Producers: Emily Hulme and Soila Apparicio
Editor: Paul Stanworth