The a/c took off from Turweston, but what was the destination & purpose of the flight. I would assume a PA-30 was IFR equipped and it seems the pilot was IFR experienced. How far is the crash site from takeoff, and is it in the direction of the planned flight? If the weather was as bad as is reported one would assume an IFR flight was planned. I remember the SE performance on PA-30 was not great, but that was with 3 up. Solo should have been better. Still curious as to what might have happened. Over to you, AAIB.