If you have a concern about the safety of a Vulnerable Adult you should discuss this with Social Services.
Follow this link for more information, and how you can contact the appropriate people
If you suspect or believe a child is suffering or is likely to suffer significant harm including any form of mistreatment or abuse, you should report your concerns
Follow the link below to the Local Safeguarding Children Board website, to see who you should contact
http://www5.cambridgeshire.gov.uk/lscb/report (this link will open in a new window - popups must be allowed)
This website also gives more information about Safeguarding Children