You must have a valid passport to enter the UK. It should be valid for the whole of your stay. You may also need a visa, depending on which country you're from. Check if you need a visa to come to the UK.
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Entry to the UK as a Tourist
UK Tourist Visas allow American citizens to enter the UK without the need for some of the more formal routes of immigration. Tourist visas are valid for any period of time up to a maximum of 6 months.
You will now have to pay more for your UK visa as the fees and health surcharge paid towards the UK's state-funded National Health Service (NHS) by visa applicants from around the world, including Indians, are set to rise significantly to meet the country's public sector wage increase, Prime Minister Rishi Sunak said ...
U.S. citizens with valid passports traveling for tourism or business can enter France without a visa for a period of 90 days within each six-month period. For French visa information please see the French Embassy's website .