It was this window


Jeremy said you can use a thin metal blade to force open the window the catch. However BEFORE and AFTER the murders took place there were no scratch marks found on those windows. The scratch marks found on the 1st of October were put there on the 16th of September when Jeremy had no keys.


June to July - Windows freshly painted
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August 7th 1985 - Massacre
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August 22nd - Police examine windows find no scratch marks.
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September 8th 9th 10th - Police re-examine bathroom windows after JM "comes forward" they find nothing.
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September 16th Jeremy needed to get travel documents from WHF forgot key. Used hacksaw to enter via bathroom window
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October 1st DI Cook and Brian Elliot discover scratch marks and hack saw.