Bos,
I don't think anybody disregards the lighthouse keepers version of the weather. It is likely, indeed very likely that the crash site was in fog.
But take a look at some of the photos published on this site. The edges of a fogbank can be very well defined, so even an observer an "estimated" 100m from the crash site may not be able to see his nose, while 50m away there may be unlimited visibility in three directions. What we are looking for is certainty, not opinion. There was no (surviving) observer at the point of impact.
Mr Holbrook does not show conclusively that the crew were legal VMC. However, if he could see the Mull and the aircraft at ranges of around 2nms, it is likely / probable that the crew could do the same. In other words there is nothing in his testimony to show illegal low flying.
Last edited by dalek; 29th May 2010 at 10:13.