Tell them to go do one. They are trying to scare you into this; they won't take you to court. Copyright infringement is a civil case (unless it's piracy or mass distribution / selling of said item) and would be done in the small claims courts anyway, it's a load of rubbish. Only reason for them to "sue" you would be over any damages; and unless they are selling the image for some reason - those damages would be exactly £0 (and if they are, they would have to prove how much they make on selling these images, which in all likely hood, is probably £0). I'll give you £10 anyways .