Britain ‘failed to establish legitimacy’ of Iraq invasion

That's because it wasn't legitimate.

in reference to:

"The US and UK failed to “establish the legitimacy” of the invasion of Iraq within the international community, according to Britain’s former ambassador to the United Nations.Sir Jeremy Greenstock told the Iraq inquiry on Friday that while there was sufficient ”legal cover” for the war to topple Saddam Hussein it was of “questionable legitimacy”."
- FT.com / UK - Britain ‘failed to establish legitimacy’ of Iraq invasion (view on Google Sidewiki)