The most accurate way to verify someone's identity is to request and validate more than one form of identification against the person standing in front of you, with at least one of them being a photo ID.
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Acceptable personal identification documents include:Passports of non-EU nationals, containing UK stamps, a visa or a UK residence permit showing the immigration status of the holder in the UK. A current UK or European photo-card driving licence. UK full or provisional photo-card driving licence.