Thank you for your help!
I'd like to do the course in english to improve it anyway. So I will not do it in France.
I hesitate between three countries. All of them offer the coure in english:
-of course, in UK at Stapleford
- Belgium
-Spain with Aerofan, very cheap.
I guess in UK it would be the best for sure, but it is the most expensive.
Belgium and Spain, offer only the course in english, I mean at of the day you can speak french or spanish

Well in Spain I'll have to speak english cause I am very bad in spanish...
In Belgium, I gues if really I don't understand (which suprise me) I can ask questions in french.
Thanks for your advice