It wouldn't require permission from the trustees and/or the Eaton's. The CCRC have wide reaching powers and if a reconstruction of any type required entry to WHF then the CCRC could order it to happen.
The CCRC would need very good reason to spend money and time on reconstruction
They’d need really good evidence that the original findings were wrong, and there isn’t any — it’s just wishful thinking on a few supporters of JB who are like dogs with a bone....
There’s NOTHING to even suggest the original findings were wrong: several police officers carried out the experiment and it was all witnessed and logged.
I dare say that the original latch or even the whole window was repaired or replaced after Jeremy Bamber killed his family and it became public knowledge that the window latch was faulty. As if they’d leave the house unsafe for some random burglar to break in! I bet it’s one of the first things they made secure.