Welcome @BigWillyLittleTodger
From what I can tell from the reporting, each of the witnesses (PH, LH, SF) has mainly been taken through their witness statement and asked questions about what is in the statement, how they chose the articles for the trial, when they first knew about the alleged UIG.
None of the questioning has sounded to me particularly onerous/invasive, given that it was supposed to be cross-examination. I think Antony White KC is mainly letting them tie themselves up in knots.
There were some extra questions for SF because of the email trail. LH spent most of the time in tears. PH by most reports spent most of the time arguing with AW KC and had to be told not to by the judge on several occasions.
(Other opinions are available)