"i. ... Had it not been for the abundant evidence, available to Mr Peacock, that the system was in proper working order, we would have regarded this failure as a material failure in the duty to carry out a proper investigation."
"i. ...Mr Peacock was aware of the practice of using the buzzer to admit personnel and it was his conclusion that this explained the fact that the cleaners did not appear on the activity log. Given the evidence then available to him, this was a reasonable conclusion to have reached. Whilst it will always be possible for machines to malfunction, this possibility was, on the evidence available, so remote as to justify rejection of it.
"4 Conclusions: