And how will I find out? Because I've found another company, Sea Kayaking Cornwall, which offers intermediate sea kayaking classes. The one this weekend is closed, but they'll let us in on the first two days of their five day class next week - so bank holiday Monday and Tuesday. We can just squeeze it in, and frankly since it's not the Saturday and Sunday, travel is much cheaper. All I need now is a place to stay near Falmouth. W00T! I'm going for it.
PS: Tailbone much better, also went out to lunch with one of my reports and a friend of his who was sitting at another table treated us and told us about it as he was leaving. How cool is that?
LATER: Done! Have booked rooms at the Seaward Guest House, have tickets on Sunday's 11:57 out of Paddington (and 17:51 back on Tuesday), and the nice folks at the kayaking place will pick us up from the hotel! YAY!