Sorry for the families of these two people.
Ecosse, the weather you gave was for Oban, not Tiree, not sure what it was at the destination, but it can be very localised weather. Overcast at 1500, with broken at 1600, can mean anything. We do not know if this pilot was instrument rated/IMCr. If so, a cruise above at say 3k, would be pretty easy, IF the weather at destination was suitable for VFR let down. The report will cover it all. I advise,and stress to all, that if flying in UK, particularly Scotland, some form of instructional Instrument flying should be done. Dundee to Tiree is a direct route, MSA should be in region of 5000, so.........VFR at low level, is precisely that, VFR. If a wall of crap was sitting around Oban, they should have gone round, turned back, or headed South and let down over the water. We were not there so... and easy with armchair hindsight to make comment. The report may well be predictable unfortunately.