More Pre-War Intel Info From the British

The Guardian reports:

A key Foreign Office diplomat responsible for liaising with UN inspectors says today that claims the government made about Iraq’s weapons programme were “totally implausible”.

He tells the Guardian: “I’d read the intelligence on WMD for four and a half years, and there’s no way that it could sustain the case that the government was presenting. All of my colleagues knew that, too”.

Why does the British media continue to investigate and pursue pre-war intelligence claims with more vigor than the U.S. media?