Thank you for the replies so far - and a thoroughly informative read they are. I recall from my early flying days reading where it was the French Postal service in their DC4 freighters that first flew what maybe were termed monitored approaches either by hand or autopilot. The minimas were Cat 3 stuff and I believe one pilot flew while the other hovered on the controls to take over for the landing if visual. If a go-around resulted they merely swopped tasks and had another go.