I have a couple of tracks with Django playing fiddle. Check out the website www.hotclub.co.uk - join the forum and ask the same question again. In the main it was grapelli who played violin. There are tracks with Eddie South on aswell. It depends when the record was recorded.
I am having a guitar lesson tomorrow with Diz Disley!! Dave do you remember Steve's partner, Denny playing with Grappelli? Or Steve with Django's brother joseph?