A nice tumblr from someone with a crush on him:
http://dirkbogarde.tumblr.com/page/4
He seems to be one of the last upper class actors, like Niven and Le Mesurier, a certain confidence and screen presence not replicated in today's stars.
http://forums.filmnoirbuff.com/viewtopic.php?id=345
He was once planning to come to the Chester Literary Festival, sadly he didn't make it.
Never read any of his books, but there on the to read list.