The write-up was in the Angling Times, and the ground-bait was the concuction of a guy who wanted a working ground- bait (GB) for Bream.
He was mixing Coshida cat food with crumb and putting the lot through a riddle at least twice to make sure the cat food was broken down and the juices absorbed by the crumb. If you get it right the GB will be on the dry side and will explode from a feeder, a lively mix.
He had been catching some large bags of Bream using the above mix, but I've had huge bags of Bream using just Brown Crumb and Sweetcorn.