BOAC: whether there was the intention to autoland or not (and I agree, I doubt they would be able to engage the full CAT III) they had the AP following the glide and loc and the AT engaged and with full authority to act on the faulty RA data. If they knew they weren't going to autoland, why not monitor the AT very closely, since they'd have to take over very soon? Were they trying to stay in as much auto for as long as possible?