DB,
HC has quite properly corrected me, and I am sorry for having doubted you. I only saw an abridged version of the report and that key bit of information was missing. Nevertheless I remain mystified as to how an experienced crew, who must have been aware of the developing situation, failed to convey their concern to their control room. I guess that we will never discover what really happened that night. The Pilot and the Police Crew were all experienced yet..........
TF