Jeremy supposedly left White House Farm through the kitchen window, banging it from the outside to drop the catch back into place and making it appear no one had left through the window. This was a theory put forward by the family because the catch was supposedly faulty.
Evidence now sits with the CCRC that a builder, Michael Horsnall, gave a statement pre-trial that he had replaced that very catch in JULY 1985. The month before the shootings at White House Farm. Of course, this was never told to the jury. It seems Essex Police knew Jeremy didn't leave through that window but pushed that theory anyway.
All that matters is that Jeremy Bamber was able to enter and exit the house without going through the doors. He admitted at the time that he knew how to enter the house via the windows. He entered and exited the house via the windows when he needed his passport. And that was after the murders.
It was never properly established what window he got in and out of, and at trial what was presented was a theory based on plausibility.
It is also not known how he got from Goldhanger to WHF and back again, but a plausible theory was used to fill the knowledge gap.
The evidence that condemns Jeremy Bamber (in this particular matter) is his admission that he knew how to enter the house via the windows, and the fact that he actually did enter and exit WHF by this very method after the murders had taken place. That is the only concrete evidence regarding the windows.
It should be remembered that Jeremy Bamber was convicted on many, many small pieces of evidence. His eventual conviction was death by a thousand cuts.
The fact remains (with or with a new fitted catch in July) that on the 7th August between midnight and 3 am, Jeremy Bamber knew how to enter and exit WHF via the windows.
And that undeniable fact is just one of those thousand cuts. Just. One.
No locksmith is gonna get him off. Oooooh no. No, no, no. Nopety nope. Nyet! Nein! Non, non, non.....and so on.