Cowboy
Both BAe and RR briefed us about the cause of the accident afterwards which was that the design needed to run a crucial component over-spec to achieve the desired aircraft performance. When the engine "let go" then it severed all the main hyd circuits that were (and still are) at risk to uncontained failure (plenty of examples of this before and since) - I believe that it was a BAe sanctioned design?!! The fix afterwards was to not fly too fast (known as "speed of the day" that was less than company recommended design Vne) until the crucial component was modded and fitted. So I see both BAe and RR have parts to play during the design phase of the aircraft.
The B Word