The references to the Graham Hill accident are from a historic accident where the main issue was a miscalculated approach into Elstree, the knock on effect from the accident was that Graham Hill was a well known racing car celebrity who had his life managed by an agent who should have kept all aircraft records in currency & also advise Graham Hill of his licence revalidation requirements. Sadly his agent wasn't clued up in Aviation & his incompetence caused the Hill family a lot more distress than just losing a family member.
The same circumstances came to light in the Colin McCrae Helicopter accident, so it would seem whilst the agents of Hill & McCrae believed they had their clients best interests at heart, they just didn't understand Aviation sufficiently to keep their aviation concerns fully covered.
I have flown celebrities & flown with celebrities and they are just happy to be getting where they want to be, they really don't care whether it is a Cessna 150 or a Kingair as long as they get to their destination.