<<<<ADP which did not ensure the runway was swept, as required, prior to the departure of the Concorde flight.>>
Presumably a French local requirement? It never happened during all the years I worked with Concorde at Heathrow>>
Sorry if my point was unclear. The runway sweeping was a scheduled requirement, not directly related to Concorde, but would have been carried out immediately prior to the take off according to contemporary reports. It was delayed due to staff being involved in fire drill as was a scheduled runway inspection. Abandoning operational requirements for a drill is as negligent as any other of the contributing omissions.
This whole involuntary manslaughter nonsense is just the latest Health and Safety PC fad. Hopefully the investigative nature of the Napoleonic Code will deal more equitably with the facts than the adversarial nature of the British/US systems