I agree with you about Ogdon - one of the greatest. Do you know his performance of the Busoni Piano Concerto? Also Ogdon was a composer, and wrote a piano concerto. I have heard it once, but can't remember it. Ogdon also performed Sorabji's piano works: his technique was just out-of-this-world. I would like to know the real truth about his death. Did he commit suicide?
Busoni PC - you might like to look at the thread about string quartet audiences to find out something alarming about this piece...!
I have never heard a suicide theory about Ogdon.
But he was, at his best, a stunning pianist, as the recent programmes on R3 demonstrated.