Requirements to enter France from the UKThe passport must be valid for at least 3 months beyond the expected date of departure. UK passport shouldn't be older than 10 years. British citizens will soon need an ETIAS visa waiver to go to France, or anywhere else in the Schengen Area.
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Passport stamping
show proof of where you intend to stay, for example, a hotel booking or proof of address if visiting your own property.
show proof of insurance for your trip – check FCDO's travel insurance guidance.
show a return or onward ticket.
prove that you have enough money for your whole stay.
The UK is part of the EU but is not part of the Schengen area, a visa to the UK does not give access tot he Schengen area. That is why you had to get a UK visa not a Schengen one to enter the UK and why a UK visa has no use to you to go to Paris. As already stated above, you need a Schengen short-stay visa from France.
UK nationals are required to have a valid ETIAS travel authorisation if they travel to any of the European countries requiring ETIAS for a short-term stay (90 days in any 180-day period).
Your ETIAS travel authorisation is valid for three years or until the travel document you used in your application expires - whichever comes first. It is for short-term stays: a valid ETIAS travel authorisation entitles you to stay in the European countries requiring ETIAS for up to 90 days within any 180-day period.
ETIAS will cost 7 euros (about $8 or 6 British pounds) for a three-year permit that allows third-country nationals to enter the Schengen Area for up to 90 days within a 180-day period.
ETIAS will be a largely automated IT system created to identify security, irregular migration or high epidemic risks posed by visa-exempt visitors travelling to the Schengen States, whilst at the same time facilitate crossing borders for the vast majority of travellers who do not pose such risks.