sycamore
If you read the findings of the Investigating BOI as submitted to the AOC 1Gp you will find that they come to the following conclusions:-
para 16e " The weather was suitable for the flight but would have required flight in accordance with IFR in the vicinity of the Mull of Kintyre."
para 32c " in the forecast conditions, the icing clearance would have allowed an IMC pull-up from low level to Safety Altitude over the Mull of Kintyre."
para 45b " the Rad Alt setting procedures used by the crew were a contributory factor in the accident."
para 51 "Furthermore, any visual contact with the Mull or Lighthouse in the prevailing weather conditions should have prompted a reduction in height and speed well below those at impact