Thank you for shedding some light on the matter Proviz. I am familiar with the Delsaux text...my memory of an alleged Ambrose book...well, I certainly must have gotten myself confused(you know, I am the only one who can do that ) That being said, until a history of the Marathon (en Anglais) is published, I shall have to be content with reading Mr. Ambrose's brief account of the 1964 event in one of my slightly dusty copies of Motor Sport. Cheers--GH.
Closest thing I have seen is one of the old Transport Source books I bought years ago at Chaters, think they are impossible to get hold of new nowadays (does anyone know what happened to them?)
It was basically a collection of cuttings from The Motor, Autocar & Autosport. Only covers 1951-71 so none of the early years.