alwayslookingup - many thanks, that was the one. I remember it as I was on duty at Linton that day but didn't actually see it - view was blocked by the Fire Section (although we all heard/felt the thud). The motorbike in question was a friends enduro bike that was parked against one of the hangar offices where it was struck by debris. That was a bad time for accidents as alwayslookingup mentions. Too many good men were lost.