For nationals of the European Union (EU) a national identity card is sufficient. Travelers from all other countries must carry a valid national passport and one other form of identification.
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If you are asked to prove your identity, you can present a passport, valid French ID card if appropriate, or a driving licence. Non-citizen residents in France can also show their French carte de séjour.
To avoid the potential distress of having to be questioned at a police station, it is advisable to have a valid form of ID on you when out and about. If you do not want to carry around the physical or original form of ID, photocopies (of good quality and ideally in colour), will be accepted by the police.
Passports are required for all passengers travelling to the UK, including children. Your passport doesn't need to be valid for a minimum number of months to travel, as long as it's valid for the length of your stay in the UK.
In place of a passport, you can use WHTI-compliant documents like passport cards, trusted traveler's cards, and NEXUS cards. While these allow you to travel to these regions by sea and road, they are not acceptable for international flights.