The UK had a key role in the Iraq War, and even before it happened there were millions of us on the streets marching against it: we said in advance that it was unjustified and would escalate terrorism in the region. (There's a video going round at the moment of Jeremy Corbyn back in the day, saying exactly that.) Now, looking back from a 2016 in which we have Isis/Da'esh and waves of refugees, there's no pleasure in the confirmation that we were right. The consequences reverberated not just through the region, but through to the EU and the UK too. Millions of us ignored, and so many killed (not least, directly killed in the war), because Tony Blair had pledged to Bush: "I'm with you, whatever".
Some quotes from the article:
"[The inquiry said] 'we consider that the UK was, in fact, undermining the Security Council's authority.'"
The inquiry received 37 legal responses regarding the war's legality, "reflecting the views of 57 expert individuals and six organisations. Just one of them supported the claim that the war was lawful."
"On 31 January , Blair met Bush and offered a commitment that contradicted the legal advice given to him by Goldsmith the previous day."
"[Goldsmith's] formal advice - the 7 March document permeated with an understanding of the uncertainty and risk involved in going to war - was deliberately withheld from cabinet."
Our government (and related organisations such as the UN Security Council) are built with checks and balances, so that things such as ill-advised wars on the basis of misconstrued information should be less likely.
The article is well worth a read.