Just found some nice portrait photos of Bugatti driver Mones Maury, or more exactly
Don Pedro José Monés y Maury, first Marquess of Casa Maury - 1895-1968 (often quoted as Jacques Mones Maury)
at : http://www.npg.org.uk/live/search/person.asp?LinkID=mp63269

One of his wifes, Paula Gellibrand, was a favorite model of Cecil Beaton :
http://www.geh.org/taschen/htmlsrc9/m19730...html#topofimage
and
http://www.npg.org.uk/live/search/person.asp?LinkID=mp64738

Any infos concerning his family, his "Spanish-Cuban" background, his connection to the Vizcaya brothers, to Martin de Alzaga?
(Martin Máximo Pablo "Macoco" de Alzaga Unzué (born on 25 January 1901 - died in 1982;
photo at : http://www.brooklands.org.uk/news/zborowski.htm)

Thanks for those links, Robert
Can't help with any more Mones-Maury info
I wonder if Rodriguez Larretta was Alzaga's riding mechanic? Or possibly Riganti's?
And if he was the father of Alberto "Larry" Rodriguez Larretta, one of the leading Argentinian drivers in the 1950s (and a name known to countless current F1 followers from the fact that he was a starter in his home GP in 1960)

Bumping this as I've just read a reference to Mones Maury in an unexpected source - Andrew Roberts' "Eminent Churchillians".

He is described as Marquess de Casa Maury, a Cuban playboy, Wing Cdr and Senior Intelligence Officer at Combined Operations during WW2, known as "Bobby" and pre-war one of the hangers-on to Lord Louis "Dickie" Mountbatten known as the "Dickie Birds". Mountbatten was in overall charge of the Dieppe raid and put Maury in charge of the intelligence. Apparently Maury's operation was something between a disaster and catastrophe and he was forced to resign his position.