I had my hands on a (Scallati?) 30-key English concertina and, although the reed system may not be not quite authentic (others may know more on this), what a fine instrument...?

I assume it was a "Scarlatti" like this one and the fact that you think it's a fine instrument says a lot about you. Once more you pontificate about something you know nothing about and get it all wrong.

For reference, the Scarlatti is made in China and I think I can speak for most Concertina players when I say that it's considered to be not much better than a piece of crap.

As an Anglo player I think it would be better for me to let somebody like Dick Miles give you some examples of "fine instruments" of the EC persuasion, but then why should he bother as you're sure not to listen.