The midair you quote was caused because a medically unfit officer with a fused spine was allowed to fly the Tutor and he was unable to look out properly.
That is not what the AAIB report said (
https://assets.publishing.service.go...and_G-CKHT.pdf). The stated cause was "Neither pilot saw each other’s aircraft in sufficient time to avoid the collision". The pilot's medical condition was a contributory factor in that it limited his ability to carry out an effective lookout
.
Remove the bonedome....let pilots and cadets fly with a soft headset and leave the parachute at home for cadet flying.
No. This is a straight duty of care issue. If you have safety equipment that you elect not to use, you can expect to be taken to the cleaners by the Courts when people are damaged as a result. There are examples in the AAIB archived reports of fatal head injuries that would not have been fatal if a helmet had been worn, and formal safety recommendations made accordingly. The parachute issue is self-evident. Better hearing protection is a further reason for wearing a helmet.
The UAS element also wear parachutes and full flying clothing because it gets potential aircrew habituated to its use, so it is less of a distraction when they start professional training. Ever watched a student get flustered because they couldn't do their chin straps up easily?