Alan, good to hear from you again. You are correct in your comment about stocking, although I do not know if it has yet occurred. On the last occasion there were 4 batches of 500 stocked at different points from Glemsford downstream.
As John said, the syndicate are secretive, so much so that I have no idea who to contact, should I happen to find out will let you know.
Have fished Stour a few times recently, in the Bures area. Still as good as ever for chub, roach and pike.