I placed both my children (12 and 15) in a private Spanish only school when we arrived in Argentina. My 15 year did great, but my 12 year didn't. After three months, we moved the 12 year old to the International school here where he has flourished. His Spanish language skills are good, but not as good as my 15 year old daughter who studied totally in Spanish.
It just goes to show that it depends on the individual child and not the age.
Sorry I can't help you with Spain, but there is lots of information on the Spanish country forum.
Good luck with your plans and don't let the language barrier be a problem. My kids love it here and don't want to think about London.
Michelle
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