“I don’t know what was going through David’s head at the time, but when I saw him giving evidence to the parliamentary foreign affairs select committee he was extremely distressed and not in control, which was unusual for him. I’m sure it must have been traumatic.” Referring to Dr Kelly’s belief that there was no evidence of WMD in Iraq, Prof Hay added: “He was in a position to rubbish the Government’s line and they need to quell that. David had great integrity — he was interested in the truth.