Across the road from the defunct Scott Street bridge is this concrete wonder; the Maizecor tower. It's on Wincolmlee, an old riverside roadway where Hull gradually extended northwards outside of the city boundaries.
Maizecor take maize (not surprisingly) and turn it into all sorts of wonderful products. It's the only such mill in the UK. They have a website that will tell you all you want to know about what they do and how they do it, it's here.