Just to say as it’s currently against FCO essential travel your travel/accident insurance will be invalidated on most normal insurance policies.
Depends whether your bothered I guess...don’t have a crash
This, I guess, will depend on the insurance company. My insurance company has assured me I'll still be covered for accidents as usual. I won't be covered for any Covid-19 related medical bills.
I'm with Snowcard so perhaps they're more specialist than normal travel insurance companies.
The other side of the quarantine coin is currently France don't have quarantine restrictions on travellers from the UK. If that changes I'm not sure there would be any point going to Font for 2 weeks of quarantine only to return to the UK for another 2 weeks of quarantine. Unless you're going to Font for a lot longer than 2 weeks or really love self isolation.