The Daily Sail are running a couple of articles on the National 12 this month, the first one is about the history of the class and is published already. The second one is on recent developments and will be out soon.
To read the article you have to be a member of the Daily Sail, but they do have a 10 day FREE trial offer ;)
http://www.madforsailing.com/ism/articles.nsf/nav/Articles-Features?OpenDocument&start=1&count=30
Happy sailing
Graham