Was going to mention concertina.net but Jane beat me to it. Now at work I can provide the link (not in the link section from what I can see).My interest in this is that I have an old Lachenal English concertina anfd one day I will get around to learning to play it - especially when my knees give out doing Morris. Need to somehow get over the potential barrier that is stopping me from starting - scales and such like, I don't play any other instruments. It was my brother's 2nd concertina (he onto his 3rd) and was bought to replace his first which was not "concert pitch". I take it that this may mean that his first was an ex-Sally army model.
Cheers Rana