Missing People
From w4mpedia
https://www.missingpeople.org.uk/
Missing People is a UK Charity for anyone affected by missing people, or people thinking of going missing.
They can help with 'Lost Contact' tracing, to find a family member who you have lost contact with but there is not an open police investigation.
They also have a free, confidential phone line for people who are thinking of leaving, and online guides to help people to decide what to do, and how to stay safe.