In reply to Co1in H:
Walt Unsworth's book 'Everest The climbing history' lists this as one of two separate post-monsoon expeditions which shared an LO and a permit, but which 'retained a certain amount of independence on the mountain'.
Mazeaud was the leader. Jean Afanassieff, N Jaeger, Mazeaud and Diemberger summitted on October 15 via the South Col route. At the time Mazeaud was the oldest person to summit (aged 49). Can't imagine why Diemberger wouldn't write about it somewhere.