Police traced a paedophile to his home after the indecent picture he took of a girl had a giveaway shop sign in the background.
David Mellor, 62, didn’t spot he had included it when he photographed the underage girl, in his kitchen and posted the picture on the internet.
But officers in Lincoln recognised the sign and identified the street and his home from the picture’s angle.
The image was seen on a file-sharing website by a specialist officer with the Child Exploitation and Online Protection unit.
When police raided Mellor’s property they found more then 8,000 indecent images of children on a computer.