If you go to the MYA Racing Calendar, find the 6m Nationals entry, click 'find out more'. The page should refresh to one showing a small NoR with the entry form below it. Click on the NoR to enlarge. That's how it works for me using Chrome at least.
The angles of the stern and the bows and the 'bustle' in front of the rudder make them look very similar to John Hanton's boat in the 'what is it' forum post further down the page. Alas it doesn't get us much further regarding it's design. Shaun. GBR916