You must ask the Home Office to check an employee’s or potential employee’s immigration status if they cannot show their documents or online immigration status.
This could be, for example, because they:
have an outstanding appeal, review or application with the Home Office
arrived in the UK before 1989 and do not have documents to prove their immigration status or right to work
You must also ask the Home Office to check their status if they have:
a digital or non-digital Certificate of Application that says you need to ask the Home Office to check their right to work
an Application Registration Card
Application Registration Cards must state that the work the employer is offering is permitted.
The Home Office will send you a ‘Positive Verification Notice’ to confirm that the applicant has the right to work. You must keep this document.