Padhist,
AFAIK it was only Scampton that had the autoland. At Cottesmore we were rather envivous but I have to say we never diverted, even on Red, provided we were allowed a stab.
The Blue Star filling station on the A1 was one mile finals. The skipper reckoned that as long as he was at 300 feet, on heading, then we would land. We certainly had to do this one night, gin clear but the cockpit vis ws less than 2 miles. We had been pounding the circuit and collected cement dust from Ketton that fused on the gold-film heated windscreen. I can't recall whether it was SOP to switch it off at low level or to leave it on.