Fantome, read the last page of the Pprune thread on the fatal helicopter crash of the pilot who was trained by One Iain King, especially the post by "Sir Niall Dementia".
Iain King had "form" as the police would say, and allegedly had been involved in multiple acts of dishonesty over the years.
The allegation at the heart of the matter was that records had been forged to deceive either the CAA or the owner of the helicopter involved in training.
To put that another way, I always wondered why my instructor wanted me to refuel and bring back the receipt on my cross country exercises. Now I know.
The fact that the actual cause of the fatal accident was poor airmanship by deciding to fly in bad weather is not material.