Well said, Robert Hodge.
Some people spread their fears either in panic and some with dishonesty
Residence : https://www.interieur.gouv.fr/Actualites/Le-ministere-de-l-Interieur-se-prepare-au-Brexit/Sejour
Will it be necessary for UK nationals to obtain a residence permit? What steps will it take to obtain a residence permit?
With withdrawal agreement
British nationals present in France before 31 December 2020 will have to apply for the new title provided for in the withdrawal agreement. They will be able to apply before the end of July 2021, under terms and conditions that will be specified later.
British citizens arriving in France after 1 January 2021 will have to apply for a common law title.
Without withdrawal agreement
It will be necessary to apply for a residence permit after the date of withdrawal from the United Kingdom of the European Union.
British nationals residing regularly in France before the date of withdrawal from the United Kingdom will have one year from the date of withdrawal to obtain a title under simplified terms. The application for title must be filed within a period to be specified by order in council.
During this period, their rights as regards residence, employment and all their social rights will be maintained.
What are the official criteria for British residents already living in France who would like to apply for a residence card?
With withdrawal agreement
The criteria will be the same as those currently used for the recognition of a right of residence for a national of the European Union. British nationals must prove that they fall into one of the following situations:
Either be employed (or have been employed and registered as a job seeker)
either have sufficient resources for oneself and one’s family, as well as health insurance
Either pursue education or professional training, and have health insurance
Either be a family member of a British national or of the European Union who has settled in France before 1 January 2021 and has a right of residence there (spouse, child, ascendant, partner, concubine or family member supported or in the household of a British or European Union national).
Without withdrawal agreement
British nationals residing regularly in France before the date of withdrawal from the United Kingdom and present for more than 5 years on French territory will have access to a resident card.
British nationals residing regularly in France before the date of withdrawal from the United Kingdom and having less than 5 years presence will be able to apply for a residence permit under common law according to their situation (employed, temporary worker, self employed, retired, student, retired, third-country national, British family member) under light conditions.
Will the residence permits obtained before March 2019 still be valid after the March deadline?
With withdrawal agreement
Titles marked “European Union Citizen” obtained before the date of withdrawal from the United Kingdom of the European Union (which are not compulsory to possess) will continue to be valid until 31 December 2020. However, after that period, they will have to be replaced by the new title provided for in the agreement. Applications for title may be filed in accordance with a schedule to be specified at a later date and in any event until at least July 2021.
Without withdrawal agreement
Residence permits obtained before the date of withdrawal from the United Kingdom of the European Union shall remain valid for a maximum of one year after that date. They will have to be exchanged during this period, including if it is a permanent residence card, which will allow British nationals to hold a new title corresponding to their situation.
Is a British national who has received a residence permit obliged to make arrangements to exchange it if he moves?
With or without withdrawal agreement
British nationals who have received a residence permit before the date of withdrawal from the United Kingdom of the European Union will be obliged to exchange it. On this occasion, they will be able to report their change of address.
Will residence permits issued in France allow mobility within other EU countries?
With or without withdrawal agreement
Residence permits issued in France will allow, in addition to the establishment in France, to circulate in the other States belonging to the Schengen area for periods not exceeding three months.
Cross-border treatment