Update; CAA have now condescended to allow FLS to issue concessions for customers other than Airtours. It follows an(other) incident where an airtours aircraft departed under a concession for a duct clamp being held together with ty wraps, which consequently failed and caused depressurisation.
CAA are currently camped out at Diamond Hangar going through all records. I am led to believe that they have given management a list of requirements to be met within 7 days, if not, who knows what could happen?