Have you been in a british police force? their notebooks are their bibles ( just in case they make "mistakes " or forget things.) So just saying we had a meeting would not be enough . somewhere they would note the details - and I am guessing they are held in the protected file about JM
Their notebooks often don't provide a great level of detail beyond generalities of dates, times and where they were or who they spoke with. Their pocketbooks were provided to the defense they were not content with that they wanted their work product meaning anything they wrote that gave their impressions of things.