Konfir can be used by anyone who has been employed or paid tax in the UK. This includes all types of paid employment but does not include unpaid / voluntary employment.
Konfir cannot be used to verify employment history outside the UK (i.e. foreign employment). This includes employment completed in: Ireland, the Channel Islands, the Isle of Man. To verify foreign employment your will need to contact your verifier directly, who will be able to provide alternative methods of verification for you outside of Konfir.