Cheers Inland, and I did look there, but it was such a tiny bit of information I thought i'd ask here as well, as it turns out most of the replies suggest raking the rudders forward as did that site.
I'm reluctant to attack my rudders with a file/rasp/disc grinder simply because it was suggested to do so in a paragraph on a website.
Always best to see what others with experience have to say - I guess i'm paranoid and dont trust everything I see, not such a bad thing when the cost of these boating bits are so expencive.
Rod.