beardy, thanks. However, there were quite a few concerns about the integrity of the Voyager-modified A330 at the time, given some of the reported issues. Hence my reasoning that an autoflight system bug could perhaps have been the cause of the unplanned descent.
Given the MoD's statement concerning the subsequent 'training and procedures' amendments, it wouldn't take a terribly bright lawyer to probe into the question of whether 'negligence' or basic 'ignorance' was the issue - 'ignorance' as in the true meaning of the word: 'lack of knowledge'.
So a lawyer might choose to ask:
What training, theoretical and practical, was given to Voyager pilots?
Who gave this training - and what formal qualifications did they hold?
How often were Abnormal Procedures involving s/s priority or jammed s/s practised in the simulator - and what formal qualifications were held by the assessor?