The UK Border Agency (UKBA) rejected the application on Tuesday due to insufficient proof of identity.
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Several state governments have recognised Aadhaar as sufficient proof of identity and address for various social schemes.
They might point out that email-compatible systems like PGP provide a much better proof of identity than an IM handle.
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Authorities say the number will be a general proof of identity.
One of its campaigns is designed to ensure that more children are properly registered - as otherwise they have no proof of identity and "no legal existence" - and it cites estimates that 51 million newborns go unregistered every year.
The agency told Mohammed he had provided insufficient proof of his identity and work with British forces.
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The quartet offered up proof of their identity, including what they said was the original ransom note.
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He has been in the UK since last year but was told earlier this month his asylum application had been rejected because he had given insufficient proof of his identity and work.
Those selling scrap metal to dealers did not have to provide proof of their identity and, unless this was tightened, it would be "almost impossible" to charge someone if the material was obtained illegally.
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But those behind the project are eager to point out that they may never have conclusive proof of the body's identity.
Scrapyards that signed up to the scheme request a passport, national identity card or photo driving licence, as well as proof of address.
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