Thank you so much, that's really useful. I live in Cornwall so its more surfing than windsurfing down here (I do that too) but I'm going to Weymouth/Portland in Dorset next week to windsurf, do you know it? The 2012 Olympics are coming there...
I'm used to 3.5 to 4.5 sails, sometimes a 5.0. I don't really have a favourite discipline, I like them all!
Thank you again, Polly