CRB checks are now known as DBS Checks (Disclosure and Barring Service). Despite the change of name, the process of competing a form and getting this checked by one of the Devon checkers remains the same: CRB Welcome Page
Checks still need to be updated every 3 years, however you don’t receive a reminder when it has expired! If you need to complete a form, please request one. Details of where to get one from at the link above.