Thank you Jetdriver. So would that situation still occur if you disconnect the AP at say 700', athr in speed mode, with the missed app altitude set (eg 3000' in FCU)? Would the FD's suddenly command a climb if you drop below MDA? Or want to level out perhaps? I don't quite understand what would happen if you have manual control of the aircraft, flying visually on to a rway with them turned on. Why not also switch them off on an ILS approach once visual?
I feel like I'm missing something startlingly obvious here!! Perhaps this is something I need to see in the sim!