The lucky finder will soon own a special copy of Hold Still: A Portrait of Our Nation in 2020. It is decorated with a golden bow and inside they find a letter from Catherine.

Not only this, Prince William’s wife went out with a stack of books. The judges, those whose photographs are included in the book and the so-called book fairies – a worldwide network of literature lovers who hide books to find, read and leave them for others – are also hidden books.

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The initiative for the photo book began last year. Along with the National Portrait Gallery, the Duchess invited people to send her to the portraits she had previously taken in lockdown. In total, he received more than 31,000 photographs, 100 of which made for selection for the photo book. These were previously shown in an online exhibition.

The proceeds will be split between several British mental health and art projects and the National Portrait Gallery