It didn't help matters during the trial, when it was Jeremy's own counsel, Rivlin QC, who suggested to PS Bews who was testifying, that what he and the others had seen, had been 'a trick of light'!
As it turns out, what Bews was referring to, was in all probability a 'trick of light', but he was looking at a different first floor window, he was referring to the bedroom window belonging to Sheila Caffell (top right), but Jeremy was adamant that what he was looking at was a person at his parents bedroom window (top left)! Jeremy was always if the impression that Bews and Myall saw what he saw, and that they were looking at what he was looking at (top left), but at this late stage, it now turns out that Bews saw something else, Bews was looking at something else than to what Jeremy had seen and was looking at! I agree, that with the moon on that side of the farmhouse, that the branches, twigs and leaves might have cast shadows or caused a 'trick of light' upon or against the bedroom window top right from that part of the farmhouse (Sheila's bedroom), until now I could never understand why Bews was saying that / this, and to be honest I think Jeremy also was confused by what Bews has said, but all that's water under the bridge now!