That's great - thank you very much everyone, for that wonderful information. I can get buying DVDs now!
If I remember correctly from the credits to Ballets Russes, there is a private archive of footage held somewhere (New York?) with a lot of early clips in, but I guess that a lot of that is staying private - for the moment at least. I also read that Massine revived works (Le Tricorne, Le Beau Danube, Parade and Pulcinella) with the Joffrey between 1969 - 1974, and I was hoping that these had been filmed, but it seems not - at least, not in totality.
Though I dont have access to the New York Public Library dance collection, I shall try and serch out the Joffrey Dance in America video, as I'm particularly keen to see Parade (or parts thereof, any parts) - at least I've got a name to search for now.
Many thanks for your help,
Jim.