Can't remember if this one has been linked before, but it's a petition to have a Public Inquiry into the CMS
Petition: Public Inquiry into the Child Maintenance Service
We are concerned that incorrect assessments and inflation of amounts owed by paying parents, combined with excessive use of enforcement action, has caused significant distress to many paying parents, leading in some cases to catastrophic consequences. We want a Public Inquiry to investigate this.
petition.parliament.uk