Skeletons in the cupboard ?
Yes, agreed, he did hold valid rating and medical.
However the point you overlook ( but the report didn't !) is whether he should have held a valid medical.
In this sad case, there were three occasions when the causal chain could have, and should have, been broken to prevent the fatal accident. One medical, one operational, and the final one, a negligent omission by the pilot himself. Any one of the three would have prevented the accident.
His FMed4 was held as is normal on Station, but the examining MO failed to read all the relevant reports in the file, for reasons not explained or accounted for. (p 42 of report).
Had he done so, he stated, that he may have carried out cockpit checks himself. He didn't read all the relevant history, so he didn't do the checks as a clinician, and the result was self evident.
Thus in accident terms, the first opportunity to "break the causal chain" was missed. Should we expect a clinician to read your file where you have a complex and serious history ? Same applies in Hospital before any surgical procedure is undertaken. The GMC would not look kindly upon a clinician who failed to read the file before treating you with a complex history!
Another lost opportunity was that when the pilot was being trained at 115 Sqn, when no less than 4 instructors commented that "the pilot could not do the full range of lookout i.a.w. CFS standard"
Another link in the casual chain missed.
On the fateful day, as the report states "...immediately before entering any manoeuvre, it is normal practice for a pilot to ensure that the area is clear of other aircraft".
How basic is that routine to those of us who have been instructors?
The report concluded that "on the basis of the medical evidence, it is highly unlikely that he would have been able to do this."
He failed to do so, and thus his omission brought about the fatal accident.
No matter what technology of an advanced nature is introduced, human failure cannot be eliminated. Despite all the other technology improvements suggested and discussed in the report, none of them would have prevented this fatal accident.
No medical granted would have totally removed the pilot from any RAF flying duty ( and possibly any CAA activity on private Class 3 medical) and prevented this unnecessary accident.