Inquiry's conclusions about Manchester attack are damning for MI5

The barrister David Anderson, who conducted the inquiry into the four terrorist attacks in the UK this year, chooses his words carefully – his tendency is towards understatement rather than anything excitable.It is the most damning finding against the UK’s domestic intelligence agency since inquiries by the parliamentary intelligence and security committee (ISC) after the murder of Lee Rigby in 2013 and the 2005 London attacks.The Manchester suicide attacker, Salman Abedi, was known