An experienced security leader at Manchester Arena said he was never told to check the mezzanine level of the City Room foyer area before the end of events and concerts at the venue.And the public inquiry into the bombing atrocity was shown an image of an area on the raised level where one witness says he saw bomber Salman Abedi waiting before he launched his deadly attack.David Middleton, a Showsec employee for 24 years, was a door supervisor with stewards working under him on the evening of