Just thought I would proffer an answer to this, for what my opinion is worth.
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I have fished matches on the KP for a long time now. The P.Stn lads never used to allow B & J til the New Year, so I will keep the point to winter fishing.
I tried the B & J on a couple of matches, drawing pegs 11 and 18. The water was warm and pumping, and they were the worst results I had on there.
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I also tried it when the water was cold and clear, with no pumping. I think those 2 matches I drew pegs 9 & 19. Again I got battered by lads using caster, squatt etc. I have only ever seen one match won with B & J, from peg 10, and he had a decent net of skimmers (about 8 or 9lb) on a cold clear KP. I have seen odd nets of roach where B & J has contributed a couple of pounds towards the total weight, but most of the total came to caster.
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My belief is that, because of the nature of the bottom (mainly gravel and "dust" from the boilers), the bottom is not conducive to B or J as a natural bait, as it is not normal silt (made up of rotted down vegetation)
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Maybe my point will give you all a bit of confidence that, in my opinion, you are not using the "wrong baits"
Results breed confidence, confidence gives you the results.