Sorry to be a party pooper but Private Eye satirises matters and scandals which are common knowledge. I regret to say that I'm not so sure that what we find important is on everyone else's radar as yet.
I would disagree to an extent. True, the satirical side tends to lampoon events that are common knowledge but there is lots of serious journalism going on underneath it all. PE has championed a number of stories over the years which have taken much longer to be reported on by the mainstream press. This is especially true regarding City scandals.
They also set up the Paul Foot award, specifically to acknowledge investigative reporters,