Post-O-level era, but I'm another all-boys grammar product. What I only realised in hindsight is how many of my teachers were either not actually trained as teachers (is that still possible?) or had come into teaching later as a second career (most had hopped across in the 70s and began retiring in the mid to late 90s). Off the top of my head, my first maths teacher was a priest, my second was a former RAF officer, my politics teacher had been a barrister, my Chemistry and history teachers were former university academics, my physics teacher had run his own business and my English teacher was a retired Royal Navy commander with an aristocratic title. Oh, and one whose subject eludes me had been a playwright, although I don't think he was supposed to have been much good at it. Of that odd assortment, there was only really one duff teacher. The younger mob of teachers who'd been along the school-university-school loop were, on the whole, a far less-inspiring bunch.