“Once you’ve completed the online application, print out the forms and take them along with your forms of ID to the post office. The documents you’ll need to take are the documents that you’ve highlighted during the check, things like your utility bill or a recent phone bill.
The post office are going to check these and send the information off to the disclosure and barring service. The cost of this is payable directly to the post office and, at the time of recording, is £8.22
There is a different DBS check in Northern Ireland, which you can find out more information about by clicking on the link below.”
https://www.nidirect.gov.uk/campaigns/accessni-criminal-record-checks