Work sporadically update the firwall ruleset to block a few more "unsuitable" web sites.
Today's update blocked all BBC News pages apart from the front page! However, BBC News is split into three versions... UK Edition, International Edition and Low Graphics Edition.
They blocked the first one and not the others. Why? Internation Edition is still high graphics and is hardly ever different from the UK version.
Oh yeah... they also neglected to block the Sports section (but that could be deliberate!).