Eddie I?ve used it in the past but like Joskin never found it makes any difference. I have found its not so good at staying on the hook as Warburtons white bread, so I seldom use it. We eat a lot of brown breads in our house, far better for your internal sh1t workings than bleached white bread because of the fibre it contains. I also like the taste as well, unlike Graham.
So a lot of it goes into my home-made groundbait for chub, but does it make any difference? I doubt it!