I witnessed the whole event from the building site side as my flat backs on to the construction site. Event took place at 3.40 and called services in at 3.42. It looked to me as if some acrow props collapsed on the top floor under the roof and then the roof collapsed and the building imploded. The brick and mortar is very crumply in the whole block and the building to the East has structural cracks and window lintels at maybe 10%. If anything, in my humble option, the scaffolding stopped the whole block from collapsing. Thank God it was a Sunday otherwise I'm certain some the poor grunts would have died. Charles