Finally - this an aerial photo taken by the Luftwaffe in Aug 1940 - as close as I have managed to get to a photo that validates what the fields actually looked like - about 8 months before the crash. It's very murky because I have blown it up hugely from the original.
You can see the gap and the trees to the left more clearly though. It would have been better if I hadn't put the arrow in the way, but the arrow does show how he could have clipped trees on just the Port side.