If you attend at Court regarding "access" or other children matters, you may well be involved with an organisation known as Cafcass. This is an abbreviation for the “Children and Families Court Advisory Service”.
A Cafcass Officer will be appointed to represent your case. It is their role to talk to all involved parties, make any appropriate enquiries e.g. with the school and police etc and then report to the Court usually with recommendations as to how the case should proceed.
Depending on the age of the children, the Cafcass Officer may also wish to speak with the children, or observe one or both parents with them. Occasionally a Cafcass Officer may be asked by the Court to be a Guardian for a child, which means they represent the child and can spend more time with a family than in most cases.