There's a poster called Gludy, who has just resolved a major altercation with a certain marine supplier, over a defective (allegedly) boat and their failure to fix it. He was using a marine lawyer that he rated very highly. I can't remember who it was, but a search for "Gludy" and "Trader" (oops) will probably reveal his name - if not, try a PM.
Nick is one of the best lawyers / guys I have ever worked with not sure if he is still practicing but he will be able to point you in the right direction. http://www.dorade.co.uk/expertise.html