Simply pointing out that trying to move abroad without understanding the implications would probably not be a good idea. After all who in their right mind would dive into something as important as property purchasing without any understanding of the implications :shrug:
Maybe wise to wait a few months and find out the answer to this first
How much will I need to earn to qualify for residency in France post-Brexit?
https://www.thelocal.fr/20190320/how-much-will-i-need-to-earn-to-qualify-for-residency-in-france-post-brexit
After all, I would be surprised if...