an ethical practioner will not sell you orthotics if you don't need them. So ask around who in your area is knowledgable, and who does not sell everyone that they see a pair of orthotics. You want someone who will charge you to assess your needs. You don't want to see someone for a "free consultation" if possible. The "free" consultants only make money if they sell you a pair, so the pressure is there to sell, sell, sell. Ask local physios who does this. Check that the physio is not financially related to the practioner they send you to. And check with more than one physio, and pick physios to ask who have worked for a while in your area of course.