Entry from Spain to France

Good question @BAHRAMB!

I don't believe it matters where you're coming from, or what your nationality/residence country is.

What matters is that you got both vaccinations in the same country, and they issued you with some kind of "Covid passport".

The EU's concept of the covid passport was that it was proof of your status as EITHER vaccinated (two jabs) OR recovered from covid (antibody test) OR recent negative PCR test. So, yes, if you've been fully vaccinated, you shouldn't be required to take a PCR test.

I did mine in Bulgaria, and they gave me an "EU Digital Covid Certificate" which has a barcode that can be scanned (by immigration officials at exit/entry) to verify my vaccinated status.

I don't know if all EU countries have already implemented this, but I believe they have.

I assumed that, as a resident of France, you got the vaccinations there. As an EU country, they should issue you with an appropriate covid passport. If, instead, as a UK citizen, you did in the UK, then you should have the NHS app to prove vaccination. But I'm not sure how many EU countries accept the NHS app. (As of this writing, I believe the UK is not yet exempting fully-vaccinated holders of EU Covid Passport from need for PCR/isolation.)

Thanks, Gwynj.  Very helpful.   I have the vaccinations and the NHS app.   Keeping my fingers crossed that that will be sufficient.