Mike
You and me both must have missed something. So far as I am concerned (albeit I was not flying) the weather was very definitely VFR by the afternoon.
Whilst I personally support after the event discussions I think comments about an accident being weather related are a bit wide of the mark unless you have reliable information or an aftercast (I might add I have neither, just my view from the garden).
Moreover I dont see how it is possible to jump to the conclusion when an aircraft lands in a field obviously under reasonable control and probably following engine problems that the accident was weather related particularly as the aircraft was flying north to south (and west) towards the better weather after the front had cleared the coast by some hours I suspect.
Moreover the aircraft almost certainly did not have a AI (it never use to anyway) so I suspect the pilot would have avoided entering IMC.