OK , - FOUND IT !!!
interieur.gouv.fr/Actualite … eplacement
Scroll down to where the downloads are “Attestation de Deplacement Dérogatoire”
Click on Francais PDF/DOCX etc and hey presto, print it off.
You’ll see the last one includes collecting children, which is the new option.
Click on the UK version, to read, if your French isn’t up to scratch.
Further down are attestations “deplacement professionel” and “deplacement scolaire”
These should be done by your employer and children’s school, for those of you that live here.