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Depends if you are vaccinated.
"Travellers who are not fully vaccinated will need to self-isolate for 7 days after arrival, then take another PCR test following this period of self-isolation.
Travellers who are fully vaccinated do not need an essential reason to travel to France and do not need to self-isolate on arrival."
https://www.gov.uk/foreign-travel-advice/france/entry-requirements
Actually, it looks like there isn't a quarentine for France any more, so I could maybe fly to Nice or somewhere and train across, and hope the French don't stamp my passport.
Hmm...