JW411,
Thanks for getting back to me. I thought as much, although it is mentioned in CAP 413; I suppose when Ben Nevis London International opens QNE might be a possibility
QFE would have come out to something like 837 mbs but the altimeter was set to 937 mbs - an error of some 3,000 ft!
Does seem incredible that they lived. At least the RoD would be slow, just as they captured the glideslope and then "What's that rumbling noise?"