You're a good man Sailhack. Not many schools can find enough interested parents to bother having working bees these days. It's good to know it still happens somewhere (I'm a teacher).
I told a mate I'd go fishing on Sunday. He's just got his first boat but no licence yet so he needs me to drive it for him. I'd feel bad if I ditched him to go sailing under the circumstances. I might be able to re-organise the day though. I went to Portland with my girlfriend recently and noted some good spots in the area. :)