The palette
Red brick for the enormous Victorian belt, and Yorkshire stone, blond and lighter, for the small centre and the civic buildings: the print works when those two are clearly different rather than blended into one brown. The Aire corridor wants a dark horizontal, water and iron together, because it is the line that holds the page up. If you mark the ring road, let it read as a cut rather than an avenue. Keep the green at the edges: this is the opposite of a city of parks, and moving green inwards would be a lie.