uk – Returning to France as a resident

I’m British and have been living in France for just over 5 years. I am a resident without official residency papers (I don’t have to have these until June, due to brexit).

I’ve been visiting my parents in the UK over Christmas and now wish to return home.

Under the new lockdown laws, can I return to France during lockdown? Or should I panic and try to get tested and book travel before Wednesday?

I have no transport booked yet.