“A small square tile with the profile image of a beautiful angel has been claimed not only as the earliest surviving work by Leonardo da Vinci, but as his own self-portrait as the Archangel Gabriel. If genuine the tile has survived miraculously unbroken for more than 500 years, since the 18-year-old artist made it in 1471. The claim – dismissed out of hand by the world renowned Leonardo expert Martin Kemp – is certain to spark academic debate.”