No, I think you're right. I know the scheme of charges lays down the cost of a CAA medical, but a trawl of the site demonstrates no further information regarding said medical at all.
Plenty of info on the JAA class 1 though.
It could have been an oversight on the part of the call line staff of course, but when I rang and asked to book in for a class 1, I was given no choice, and now have the JAA one.