I am simply trying to tell you that, as someone who is intimately familiar with the crash site, I simply cannot imagine how he ended up where he was.
Perhaps the game plan was to fly south until 3 miles east abeam Chalgrove then a right turn onto final for the westerly runway or a modified base for the Northwesterly one but low viz prevented the turn pushing him into the higherground and lower bases.
I've driven down to London a few times many years ago and just past Oxford turn off there is a definitive break in the landscape that looks odd, where the highway has a dip then a climb into a densely forested area that's seems kind of out of place in comparison to what you have been driving thru till the dip. Is this the accident area?