What a wonderfully told story. During a flight as a co-pilot with Tony Black who was a test pilot on the Avro 748 in 1966, I watched with admiration and some trepidation as he demonstrated an ILS in thick fog to touch-down on autopilot at Hatfield. Certainly nothing like the pea-souper described earlier but scary to me nevertheless. I think he disconnected the autopilot at the flare.