The Disclosure and Barring Service have introduced an Update Service.
You cannot register until you have a new DBS application and/or get a new counterpart certificate as part of a DBS application and you have to apply within 14 days of it being issued.
If you subscribe to this service any employer can go online (with your consent) and carry out a free instant check. You will need to show them your counterpart certificate. It should be helpful to anyone with multiple employment or in private practice.
Details on https://www.gov.uk/dbs-update-service
It costs £13 a year and apparently lasts indefinitely.
My informant says to be sure that on your next DBS application Field X61 (line 61 and 62) is filled in correctly. The relevant workforce should be either Child Workforce, Child and Adult Workforce or Adult Workforce.