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A British passport is a travel document issued by the United Kingdom to individuals holding any form of British nationality. It grants the bearer international passage in accordance with visa requirements and serves as proof of citizenship. Wikipedia
Expiration: adult: 10 years; child: 5 years

British Passport Eligibility

You must have British nationality to apply for or hold a British passport.

Having a British nationality does not guarantee you a passport. For example, you may not get a new passport (or your existing passport may be taken from you) if:

you’re suspected of a serious crime and an arrest warrant has been issued a court order stops you having a UK passport or restricts your travel you’re on bail and bail conditions mean you cannot leave the UK you’ve been brought back to the UK before at the government’s expense and have not repaid what you owe you’ve received a European Union or United Nations order which restricts your travel
A passport can also be cancelled or not renewed if it’s for a child and there’s a court order in place stopping the child from leaving the UK.

Your eligibility and entitlement to a British passport will be considered when you apply.
Passports belong to the government and can be cancelled or withdrawn at any time.

Types of British nationality
You can apply for a British passport if you’re a:

British citizen
British overseas territories citizen
British overseas citizen
British subject
British national (overseas)
British protected person