I'm able to teach beginners IF I have a practice chanter I can get working and IF I'm there. It's super helpful to know when a new person plans to show up so we all can plan accordingly, but that's obviously not always possible.
I don't believe we have anyone in the band at the moment qualified to give advanced instruction (i.e. teach competent pipers how to pipe better). There used to be regular workshops for this kind of thing, but I think it's been a good while since anyone held one.