Although it’s not possible to request a DBS check on yourself, you can apply for a ‘Basic Disclosure Certificate’.
Basic Disclosure Certificates show any unspent convictions that you may have in the UK. So, although they are in no way as sophisticated as a DBS check, they do hold some merit, and at least show that you have taken some steps to prove your credibility.
Basic Disclosures can be applied for at https://www.mygov.scot/basic-disclosure/
They cost £25 and take approx. 14 days – you do not have to be from Scotland to do this.
Go to an agency
One way for you to get an Enhanced/DBS Barred List check is to go to an agency.