Here is a list of websites and contacts that may be of practical use to you with information and guidance.
NSPCC Link While the charity is not involved in the interpretation of such support this page is very useful
Nacro This is a 'crime prevention' charity that has a lot of information available about the impact of cautions and CRB disclosures although it is not actively representing those affected by cautions
Richard Baum: Blog Richard Baum is a Lib Dem councillor in Manchester. He has some views supporting review of the CRB systerm