There is a wealth of information and advice on the internet for parents in this situation, you may find some of the following sites useful:
The Transparency Project - Explains and discusses family law and family courts in England & Wales, and signpost to useful resources to help people understand the system and the law better
Family Rights Group Free and confidential advice and support.
The Children Act 1989 On the legislation.gov.uk website.
New GMC guidance – Protecting children and young people: the responsibility of all doctors.
Legal Services Commission Information on how and when you may qualify for legal aid.
HMCTS Form Finder For access to all court forms you may need if representing yourself.
HMCTS Court Finder Provides information and contact details of all Courts in England and Wales.
CAFCASS The Children and Family Court Advisory Support Service website.