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Find in depth official information for travellers concerning Passports from the UK Governments Foreign ministry.
Passport and entry requirements
This page offers guidance on issues you might encounter at passport control - such as how much validity you need on your passport, and what kinds of things might impede you at the immigraiton desk.
Details of countries you can enter using a British passport without a Visa
The Henley Visa Restriction Index ranks countries according to their citizens freedom to travel.
UK Border Agency visa services site provides information on visa requirements for visiting the UK.