Shawn,
The aircraft did not have a normal full release to service and in the normal scheme of things it should not have been in operational service at all.
It was there because the RAF was becoming embarrassed by the poor serviceability of the remaining MK1 airframes.
I think Boscombe Down were making a point by grounding their test airframe. Someone else tried to make another point about the ability of the aircraft and the rest is history.
In my opinion the negligence lies elsewhere than in the graves of the crew.