I received a lovely article on Jack Clement taken from a 1956 magazine called 'Wheels', which presumably is an Australian magazine. It also shows Clement in his J2 and a bit of background info. I've put it in my Dropbox, in case people want to read it, the last page holds the bit about the J2.
The photo looks like it was taken at 1934 Australian Grand Prix at Phillip Island where Clements led for most of the race until a broken fuel pipe on the penultimate lap cost him the race.