Primary forms of identification must include a clear photograph of the individual bearer.
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For customers flying solely within the UK, including Northern Ireland, a passport is not required, but customers must produce valid/in-date photographic ID when travelling, such as a passport or driving licence (full or provisional), employment ID, military card, residency card, etc.
In the United Kingdom, some documents are acceptable as proof of identity. These include a valid UK passport, driving license and identity cards. Birth Certificates by themselves are not considered to be evidence of identity.