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The BOI found that the forecast weather was suitable for the flight but would have required flight in accordance with IFR in the vicinity of the Mull of Kintyre.
When the aircraft was last seen in the vicinity of the Mull of Kintyre it was not being flown in accordance with IFR. The aircraft crashed at high speed whilst the crew attempted to fly VFR in unsuitable conditions which had been forecast.
It is difficult to conceive of any verdict other than that arrived at by the AOC.