If you do not have any suitable documents confirming your identity (e.g. birth certificate or passport) for a professional to verify against, you can instead use a referee who has access to your official records at their workplace.
Referees confirming from official records (also called Route 2) are professionals, who know you and can confirm your details against their official records held at their place of work.
For more details on who can act as a referee in this circumstance, please go to Referees confirming from official records page.