Race Team Mechanics.

[khyndart in CA]

29th Nov. 1975.
Graham Donaldson needed to find suitable accommodation in London before the next season and winter testing of the new GH2 Hill F1car. So Graham stayed behind while the rest of the team went to France for testing otherwise he would have been on this tragic trip back to London from France in horrible weather.
Here are some reports of that day.
(Everyone in this publicity photo died in the crash. )

("The Lost Generation" book excerpt )

This Wikipedia report states there was a lot of mistakes regarding the Hill plane which made it even harder on those family and team members who survived including Graham Donaldson.

"On November 29, 1975 returning from the Paul Ricard circuit, France, Hill was killed when the Piper PA 23-250 Turbo-Aztec that he was piloting (not registered, but displaying its previous cancelled US registration N6645Y) crashed near Arkley golf course in London, while attempting to land at Elstree Airfield at night, in foggy conditions.[15] The crash also resulted in the deaths of team manager Ray Brimble, mechanics Tony Alcock and Terry Richards, up-and-coming driver Tony Brise and designer Andy Smallman; all from the Embassy Hill team.[16] At the time of the accident Hill’s aircraft, originally US-registered, was “unregistered and stateless”. His US pilot certification had expired, as had his FAA instrument rating. His UK Private Pilot’s Licence Instrument Meteorological Conditions rating, which would have permitted him to fly passengers in the visibility that prevailed at the time of the accident, was also out of date and invalid.[15] The Independent stated he was effectively uninsured.["


(Ken Hyndman )