DAPT,
Standard Operating Procedures are for "Standard" situations.
Aviate, Navigate, Communicate - in that order.
Falcon900, I'm not aware that any suggestion has been made that fuel contamination is not a possibility. However, it is a requirement that both the aircraft and bowser/fuel Installation daily samples are retained so the AAIB will have something to work from. You may have noticed that when the aircraft was lifted from the building, one of the first things done before it went on the lorry was a fuel sample.