Simon,
Next time you may need to wear a suit and tie. <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />
One old salt said to me one day; your really don't need centreboards much if you can dig the bows in and keep the tip just skimming the surface.
He also said; you don't need rudders either if you have a jib.
Wonderful words of wisdom.
Regards,
Peter