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Do you have French ID card?
If you want to use French passport to enter and live uk then you would have to renew it. Is this possible to renew it?
i can help you for your concerns.
you are French Passport holder. you should have valid passport. if you have French National ID card then you can use this ID card to enter the UK as well.
if you want to enter after 31 October 2019 then there will be no difference till 31 December 2020. Any EEA National can enter in UK until 31 December 2020.
i hope it will help you.
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But if any EEA national want to live permanently then he/she should apply pre-settled status before 31 December 2020.
After December 2020, this facility will be ended.