Blair is off the hook. No crime of aggression under domestic UK law.

"former chief of staff of the Iraqi army General Abdul Wahed Shannan Al Rabbat had launched a private prosecution, with Blair accused of committing a ‘crime of aggression’ for ordering the invasion." Says Johathan Curtis from the Brexix news
was baced on faulse acutsation fo weopems of mass dystrucion that was the main reason for men and women to go to war.
According to the Daily Star: The general wanted to prosecute Mr Blair and two other key ministers at the time – foreign secretary Jack Straw and attorney general Lord Goldsmith.

General Abdul Wahed Shannan Al Rabbat has accused Mr Blair, while UK prime minister, of committing a "crime of aggression" by invading Iraq in 2003 to overthrow President Saddam Hussein. It seems that there is no crime of aggression under domestic UK law."
Lord Thomas of Cwmgiedd, the Lord Chief Justice, and Mr Justice Ouseley dismissed the general’s application, saying there was “no prospect” of the case succeeding.
Once again, we can’t help but stand back and admire ‘Teflon Tony’ as he has become known.
For obvious reasons we will be careful what we say here, but it goes without saying that many, many, MANY people will still feel that Blair needs to be brought to justice in one way or another for his actions during his so-called ‘leadership’ of this nation.
The legacy of this total lack of action is that Blair is now free to spout rubbish about stopping Brexit in one way or another."
also from the brexix news.