I assume it is the 8m class info that you are after and it still exists today. http://www.8mr.org/

I have info on three pre war 8m designs here in Uffa Foxes tomes on design seamanship and construction, What I can tell you is that. It was the smallest IYRU rules yacht with cabin accommpodation and that a 'young' owner could live aboard
all summer and sail at all the regattas. If you want more info I can scan the sections of books and email to you. As for the rules I am sure you can get a copy from the organisation.