As james.miller points out, it was the initial mud slingers in Fox's case that went crying to lawyers - in Katie Hopkins case, the woman she slandered wasn't even the person she thought she was slagging off, it was someone comepletely different!
There is a convicted sexual offender with the same name as the person Fox accused of being a paedophile. The man he slandered wasn't even the person he thought he was slagging off, it was someone completely different ! Thanks for pointing out this additional similarity.