Entry certificate
An entry certificate, under United Kingdom
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 (UK) immigration legislation, is an entry clearance issued to a non-visa national. Certain types of entry to the UK require the person seeking entry to have prior clearance before entering the UK, and because a non-visa national cannot be issued a visa
Visa (document)
A visa is a document showing that a person is authorized to enter the territory for which it was issued, subject to permission of an immigration official at the time of actual entry. The authorization may be a document, but more commonly it is a stamp endorsed in the applicant's passport...

, an entry certificate is issued instead.
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