happygardening' blamblam* it seems to me that you've just ably demonstrated why you don't need to be a qualified teacher to teach! plenty of graduates learn these skills in their unteaching related jobs.'
I had been working in an unrelated job for 15 years before doing my PGCE, and, despite having managed a department, found I had very few skills related to classroom management.
It isn't only about discipline, it's about (for example) knowing how long activities are going to take so that you can differentiate properly; grouping appropriately; level of voice; flexibility; knowing the group's dynamics; timing and pace; knowing what to give teaching assistants to do to maximise the children's learning - and much more....and all that has to go on in every lesson you do.
Good classroom management is so important to a child's learning, and it is a something that many student teachers find challenging.
In the new standards (coming in Sept), only 1 section (of 8) is about teaching: 2012 Standards