The Criminal Records Bureau (CRB) and the Independent Safeguarding Authority (ISA) have merged to become the Disclosure and Barring Service (DBS). CRB checks are now called DBS checks.

A DBS check may be needed for:

• certain jobs or voluntary work, eg working with children or in healthcare
• applying to foster or adopt a child

There are different rules for getting a criminal record check in Scotland and Northern Ireland.

https://www.gov.uk/disclosure-barring-service-check/overview