I have looked at this stretch as well as the syndicate bit just upstream a few times, every angler that I have spoken to on both bits that was fishing for barbel said the same about the water being almost a night only water for the barbel which go very big along there as well as another very hard fighting species that grows large.
And not only the carp grow big. Last summer I heard a shout from an angler above me, asking would I like to see a bream. I walked up, and it weighed 10lb 4 oz. I don't knock the place, and it's very well run. It's just all very "uneven", for want of a better expression: in summer, fishing very well for roach and dace during the day, but with very little chance of bigger species outside hours of darkness, especially in clear water, and yielding neither through the winter.