and search for R.S. The clips are incomplete and they're on sale: found interesting material like the Stones leaving for Montreaux in 1964 with the RSG crew. I tried to register but failed.
as far as I understood the material is in the best quality and they send to you in the format you prefer. I'm still trying to register myself and I'll ask for prices. Will keep you informed .
Updating: I managed to register. But I can't find the "add to the basket" button so that I don't know what is the price of these clips. Also I don't understand if it's possible to receive them and keep them for persoanl use. Anyway, I just wrote requesting for more information and I should receive a reply Monday next. Shall keep you informed.
And yes, Gather no moss includes never seen before clips and the shots from the Hull concert are much longer than the circulating video, same as the arrival to Heathrow Airport from the first US Tour 1964. At least we know such material exists.