Thank you all for your responses!
Do you really need full time classroom teaching ?
Why don't you do it in a french school?
I want to do it full-time because I'm not sure to really succeed doing it by my own (bases on my experience during studies). I also want to do it in England (instead of France) for english speaking reasons.
Didn't even cop that stapleford and cats were charging for assessments now,
Not absolutely sure for the prices, but yes, assessment needed...
@Transsonic2000, thanks for the details that confirm my initial info.
Choice still difficult... I continue my research and I'll let you know about it.
If you have more info or advice, I would be very thankful!