Documents & equipment required for international journey

I’m an expat living in the Czech Republic,
I’ve been doing the same route every week from the Czech Republic to Solihull for. The last six years,
last week was no problem but this week I’ve just been told that I need a covid test before entering France but I can’t find any info about it ,any help ■■ .
Heading over to the UK via Dunkerque today around 22:00.
Thanks smifffy.