It just struck me, reading your reply, that another difference between the classes we go to and (I infer) the one you experienced, is the drop-in thing. We have had a few people come along to try things out, but the general principle for ours is that you sign up for at least the whole term. You pay in advance at the beginning of term both to protect Lizzy's livelihood and as a way of committing.

I'm not criticising the idea of class that is run on a drop-in basis, but I wonder if it makes a difference to teaching style?