Especially the shower room window which Sergeant Stephen Golding found unlocked. The same window that Bamber used when he returned to WHF to collect documents.
I see you're trying to wake the dead with a question on the shower room window lock. I think the actual lock was probably more like the one we discussed earlier rather than the complicated screwed one in your recent photo, whether re-secured by string, hacksaw blade or whatever.
If we had a high-res picture of it instead of this blurred one, then it might be easier to answer...
http://miscarriageofjustice.co/index.php?topic=633.msg238502#msg238502My own view is that he left by the kitchen window for two reasons: he told Julie about it, and that in the SoC photo the plastic crockery drainer, liquid soap bottle, etc. weren't in their usual positions according to the housekeeper, as if they'd been rearranged to make it appear as if no-one had exited through that window. Banging the window shut from outside to lock it is also a reasonable assumption. Years ago, before I ever studied this case I carried out the same trick when painting some wooden casements from outside, so maybe I'm biased.