@Oxonschools: This is the information you need.
www.diplomatie.gouv.fr/en/coming-to-france/coronavirus-advice-for-foreign-nationals-in-france/#sommaire_1
If you are vaccinated:
upon boarding, each traveller aged 11 years or older must present a negative PCR test taken less than 72 hours before the flight or a negative antigenic test taken less than 48 hours before the flight.
The measures regarding pressing grounds for travel and quarantine which are applicable to vaccinated adults also apply to any minors accompanying them, whether they are vaccinated or not.
If you are not vaccinated:
you can only travel to France if you have pressing grounds for travel. The list of pressing grounds is set out in the certificate of international travel drawn up by the Ministry of the Interior.
each traveller aged 11 years or older must present a negative PCR test taken less than 72 hours before departure or a negative antigenic test taken less than 48 hours before departure.
you may be subject to a random test when you arrive in France.
you must pledge to self-isolate for 7 days."
OP, If you are having your second jab today/this weekend, you won't be considered fully vaccinated. (same page information):
"Travel documents
Depending on your circumstances, you must complete and carry some of the following documents in order to board:
proof of vaccination. It will only be valid if it proves that you are fully vaccinated, i.e.:
Two weeks after the second shot for two-shot vaccines (Pfizer, Moderna, AstraZeneca);
Four weeks after the shot for one-shot vaccines (Johnson & Johnson);
Two weeks after the shot for vaccines administered to people who have already had COVID-19 (only one dose is necessary).
Only vaccines authorized by the European Medicines Agency (EMA) will be accepted, i.e. Pfizer (Comirnaty), Moderna, AstraZeneca (Vaxzevria) and Johnson & Johnson (Janssen)."