The crew's 'Sunday' names are: Derek ARMSTRONG 33, Geoffrey WILLIAMS 28 and Gerrard Peter EVANS 32.
The Accident Card says: At the conclusion of an instrument training sortie at 40000 feet, the crew was cleared to descend to 20000 feet and this was acknowledged. 12 minutes later a brief MAYDAY call was received and the aircraft was found crashed in the sea, having dived at high speed and been intact at the time of impact. There follows several possible causes but there was no formal 'verdict'.
Hope this helps. The position is given as 35 miles south west of Malta.
Old Duffer