Completely unrelated to this post, can I just ask if I saw you walking through Manchester Piccadilly railway station at 6 p.m. this evening? I was taken aback and rushing to meet friends so did not go and say hello. Anyway, if it wasn't you, you have a double ;=) And I do agree with your last para above, except I would say that instead of expertise (a notion that sets teachers apart from students hiding behind the illusion of holding the keys to disciplinary knowledge), I would say that teachers should be confident to practice their skills AND be open to admission of their limitations. I never pretend to know all about the subject matter to students but I am confident that I can set them activities and guide them in learning in ways that stand a good chance of them learning more.