There is normally some impact, I believe they try and minimise the use of French ATC in these circumstances but not an expect to say if they can totally go around the French ATC area for Canarian to UK flights.
As the proposed strike starts on Tuesday plane locations/delays are likely to have some impact on their schedules, even if its a few hours delay in taking off etc. Ryanair historically cancel all UK to France flights when there is a French ATC strike.
Ryanair will publish their plans tomorrow so suggest you keep an eye on their website.
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