he could possbly of been heard climbing up a ladder but then he could of been heard trying to hacksay a window open as well.
Nugs you're idea is ridiculous again, and has been dismissed.
There is no way Bamber would get a ladder. Climb through a tiny window where two adults were. Then go downstairs to get a rifle.
It's the sort of thing a comic burglar wearing 'Swag' on his back would do.
Bamber didn't use a hacksaw blade on the night. He used it beforehand. The bathroom window may have been left ajar by him at supper anyway.