Depends where you are now Gidders.
If you are in the unicorn kingdom and that is where you are resident you are unlikely to be allowed to transit France as I read it.
If you are in Spain as a resident,are you likely to be allowed to transit France to go to the UK ?
The latest unclear info seems only to relate to eu residents and UK citizens, with eu residency permits who were in the UK for Xmas and transiting France will only be allowed to return to their place of residency in the eu.
Residents of France have a long list of paperwork to do now and there is a period of quarantine too.
Hopefully you are in sunny Alicante sitting on the terrace.
Via Euronews: COVID: British EU residents told they can drive home via France after day of confusion
euronews.com/2021/12/30/cov … e-through-