Seldomfitforpurpose
Apologies for the tardy reply.
With regard to the visibility at the time & place of the accident; the closest you are going to get, I would think, is the evidence given to the BOI by Mr Ellacott who was hillwalking at the time.
"I then heard the sound of a propellor going around for about four or five seconds and then I heard an explosion...Visibility at this time was only about nine or ten feet maximum". ... "It was difficult to say how far I was from the point of the explosion, but I don't think I could have been any more than 100 yards".
In addition the AAIB concluded that, at initial impact, the A/C groundspeed was "of the order of 150 kts" ..... the aircraft was erect, rolled slightly left and pitched approximatly 30 degrees nose up". The forward visibility towards the high ground immediately ahead would,therefore, have been extremely limited by aircraft attitude as well as the weather.