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Hi shivvy,
Thanks very much for your help and info, I have looked on the iTunes and Napster sites, but only the french version on there. ( I'll be using those sites a lot more, now I know about them.)
I have done loads more web searching over the weekend, including e mailing Classic FM where my dad originally heard the track , (no answer yet from them) but all the web sites seem to bring me to the French version.
I am now coming to the conclusion that, like you said, Roberto Alagna may not have recorded in English at all.!!
I'm still searching, but if I do find out, I'll post it on here, but for the time being, my dad is pleased as punch with the album I got him with the French version, and all this searching has opened me up to some rather spectacular music I had never bothered to listen to before ! :-)